{"id":40,"date":"2021-01-26T17:19:46","date_gmt":"2021-01-26T22:19:46","guid":{"rendered":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/chapter\/trichology\/"},"modified":"2021-02-19T13:36:41","modified_gmt":"2021-02-19T18:36:41","slug":"trichology","status":"publish","type":"chapter","link":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/chapter\/trichology\/","title":{"raw":"1.2 Trichology - The Science of Hair","rendered":"1.2 Trichology &#8211; The Science of Hair"},"content":{"raw":"When you are colouring hair, why must you consider the hair itself?\r\n<h1>The Hair Strand<\/h1>\r\nEach hair strand is made up of 3 layers:\r\n<ul>\r\n \t<li>[pb_glossary id=\"201\"]Cuticle[\/pb_glossary] \u2013 the outer covering made up of overlapping layers of scales. How these scales sit directly affects it\u2019s porosity, which determines how the hair will absorb moisture and chemicals.<\/li>\r\n \t<li>[pb_glossary id=\"202\"]Cortex[\/pb_glossary] \u2013 the second layer, gives hair its strength and elasticity and also houses melanin, which is the basis of natural hair colour.<\/li>\r\n \t<li>[pb_glossary id=\"203\"]Medulla[\/pb_glossary] \u2013 The inner core, or pith, of the hair strand gives hair its structure and is often missing from very fine hair.<\/li>\r\n<\/ul>\r\n<img class=\"aligncenter wp-image-178 size-full\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/hair-strand.jpg\" alt=\"A diagram of a magnified hair strand, depicting the location of the cuticle, cortex, and medulla.\" width=\"539\" height=\"289\" \/>\r\n\r\nThese various structural properties of the hair itself, as well as the hair's natural melanin, will have a direct influence on the end result of a colouring service.\r\n<h2>Melanin<\/h2>\r\nFirstly, let\u2019s revisit [pb_glossary id=\"204\"]melanin[\/pb_glossary]. What is it, and why is it important?\r\n\r\nThere are two types of melanin that reside within the cortex of the hair strand:\r\n<ul>\r\n \t<li>Eumelanin \u2013 black or brown pigment<\/li>\r\n \t<li>Pheomelanin \u2013 red or yellow pigment<\/li>\r\n<\/ul>\r\nVarying combination, concentration, and size of these two pigments produce every natural hair colour that exists. For example:\r\n<p style=\"text-align: center;\">A heavy concentration of eumelanin, with a sprinkling of pheomelanin, results in dark brown or black hair:<\/p>\r\n<img class=\"aligncenter wp-image-183\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/dark-hair-cross-section-1.jpg\" alt=\"An enlarged cross section of dark brown hair showing much more eumelanin than pheomelanin.\" width=\"236\" height=\"181\" \/>\r\n<p style=\"text-align: center;\">A light concentration of eumelanin, with a sprinkling of pheomelanin, results in light brown or blonde hair.<\/p>\r\n<p style=\"text-align: center;\"><img class=\"aligncenter wp-image-184\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/blonde-cross-section-1.jpg\" alt=\"An enlarged cross section of blonde hair showing only a bit of eumelanin and much less pheomelanin.\" width=\"233\" height=\"199\" \/><\/p>\r\n<p style=\"text-align: center;\">A heavy concentration of pheomelanin, with a good amount eumelanin, results in a deep Auburn red shade of hair.<\/p>\r\n<img class=\"aligncenter wp-image-185\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/red-cross-section.jpg\" alt=\"An enlarged cross section of auburn hair showing around equal amounts of eumelanin and pheomelanin.\" width=\"235\" height=\"192\" \/>\r\n\r\nWhen hair is lifted with an oxidative colour or bleach, eumelanin is more easily obliterated than pheomelanin. This becomes more apparent when you look at the [pb_glossary id=\"192\"]underlying pigments[\/pb_glossary] at each of the ten levels:\r\n\r\n<img class=\"aligncenter wp-image-36 size-large\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/underlying-pigment2-2-1024x376.jpg\" alt=\"The 10 levels of hair colour and their corresponding underlying pigments, ranging from black to palest yellow.\" width=\"1024\" height=\"376\" \/>\r\n\r\nNotice how the underlying pigments range from dark red to palest yellow. This is because pheomelanin is tougher to remove, so when a client tells you that their hair \"lifts warm,\" you can assure them that that is the case for everyone!\r\n\r\nWhen hair is coloured, the underlying pigment will affect the formula based on whether you want to neutralize or enhance these warm pigments. For example, does the client desire a cool chocolate brown hair colour or a more golden-brown hue? You will then use the colour wheel to create an appropriate formula.\r\n\r\nWhen going darker with a low-level developer, the underlying pigment will not be exposed, but you still must consider the existing tone of the client\u2019s hair when formulating for the desired result.\r\n<h1>Hair Condition<\/h1>\r\nWhen consulting with a client, you must also assess the condition of the hair. There are three main characteristics to look at: [pb_glossary id=\"205\"]Porosity[\/pb_glossary], [pb_glossary id=\"207\"]elasticity[\/pb_glossary], and [pb_glossary id=\"208\"]texture[\/pb_glossary]. All three physical factors will influence which products to choose and how to process the colour.\r\n<h2>Porosity<\/h2>\r\nPorosity refers to the hair\u2019s ability to absorb moisture or chemicals. Porosity is influenced by how the cuticle scales sit in relation to each other.\r\n<p style=\"text-align: center;\"><img class=\"aligncenter wp-image-190 size-full\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/porosity-drawing.jpg\" alt=\"An enlarged diagram showing the porosity of three different strands of hair. Described in following text.\" width=\"639\" height=\"209\" \/><em><strong>[pb_glossary id=\"209\"]Resistant Porosity[\/pb_glossary]\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 [pb_glossary id=\"210\"]Average Porosity[\/pb_glossary]\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 [pb_glossary id=\"211\"]\u00a0Extreme Porosity[\/pb_glossary]<\/strong><\/em><\/p>\r\n\r\n<h2>Elasticity<\/h2>\r\nElasticity is the hair\u2019s ability to stretch and return to its original shape without snapping.\r\n\r\n<img class=\"aligncenter wp-image-200\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/elasticity.jpg\" alt=\"\" width=\"564\" height=\"299\" \/>\r\n<h2>Texture<\/h2>\r\n<p style=\"text-align: center;\">Texture refers to the diameter of the hair strand and is generally described as fine, medium, and coarse.<\/p>\r\n<img class=\"aligncenter wp-image-195\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/diameter-1.jpg\" alt=\"Cross sections of fine, medium and coarse hair strands.\" width=\"605\" height=\"214\" \/>\r\n<p style=\"text-align: center;\"><em><strong>Fine\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Medium\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Coarse\u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/strong><\/em><\/p>\r\n<p style=\"text-align: left;\">With these basics fresh in your mind, let's move on to how the various colouring products work, and how to decide which product is best for the client.<\/p>\r\n\r\n<h3>Media Attributions<\/h3>\r\n<ul>\r\n \t<li>All images in this chapter are by A. Magtiza and are under a <a class=\"internal\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY 4.0 Licence<\/a>.<\/li>\r\n<\/ul>","rendered":"<p>When you are colouring hair, why must you consider the hair itself?<\/p>\n<h1>The Hair Strand<\/h1>\n<p>Each hair strand is made up of 3 layers:<\/p>\n<ul>\n<li><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_201\">Cuticle<\/a> \u2013 the outer covering made up of overlapping layers of scales. How these scales sit directly affects it\u2019s porosity, which determines how the hair will absorb moisture and chemicals.<\/li>\n<li><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_202\">Cortex<\/a> \u2013 the second layer, gives hair its strength and elasticity and also houses melanin, which is the basis of natural hair colour.<\/li>\n<li><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_203\">Medulla<\/a> \u2013 The inner core, or pith, of the hair strand gives hair its structure and is often missing from very fine hair.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-178 size-full\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/hair-strand.jpg\" alt=\"A diagram of a magnified hair strand, depicting the location of the cuticle, cortex, and medulla.\" width=\"539\" height=\"289\" \/><\/p>\n<p>These various structural properties of the hair itself, as well as the hair&#8217;s natural melanin, will have a direct influence on the end result of a colouring service.<\/p>\n<h2>Melanin<\/h2>\n<p>Firstly, let\u2019s revisit <a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_204\">melanin<\/a>. What is it, and why is it important?<\/p>\n<p>There are two types of melanin that reside within the cortex of the hair strand:<\/p>\n<ul>\n<li>Eumelanin \u2013 black or brown pigment<\/li>\n<li>Pheomelanin \u2013 red or yellow pigment<\/li>\n<\/ul>\n<p>Varying combination, concentration, and size of these two pigments produce every natural hair colour that exists. For example:<\/p>\n<p style=\"text-align: center;\">A heavy concentration of eumelanin, with a sprinkling of pheomelanin, results in dark brown or black hair:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-183\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/dark-hair-cross-section-1.jpg\" alt=\"An enlarged cross section of dark brown hair showing much more eumelanin than pheomelanin.\" width=\"236\" height=\"181\" \/><\/p>\n<p style=\"text-align: center;\">A light concentration of eumelanin, with a sprinkling of pheomelanin, results in light brown or blonde hair.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-184\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/blonde-cross-section-1.jpg\" alt=\"An enlarged cross section of blonde hair showing only a bit of eumelanin and much less pheomelanin.\" width=\"233\" height=\"199\" \/><\/p>\n<p style=\"text-align: center;\">A heavy concentration of pheomelanin, with a good amount eumelanin, results in a deep Auburn red shade of hair.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-185\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/red-cross-section.jpg\" alt=\"An enlarged cross section of auburn hair showing around equal amounts of eumelanin and pheomelanin.\" width=\"235\" height=\"192\" \/><\/p>\n<p>When hair is lifted with an oxidative colour or bleach, eumelanin is more easily obliterated than pheomelanin. This becomes more apparent when you look at the <a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_192\">underlying pigments<\/a> at each of the ten levels:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-36 size-large\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/underlying-pigment2-2-1024x376.jpg\" alt=\"The 10 levels of hair colour and their corresponding underlying pigments, ranging from black to palest yellow.\" width=\"1024\" height=\"376\" srcset=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/underlying-pigment2-2-1024x376.jpg 1024w, https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/underlying-pigment2-2-300x110.jpg 300w, https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/underlying-pigment2-2-768x282.jpg 768w, https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/underlying-pigment2-2-65x24.jpg 65w, https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/underlying-pigment2-2-225x83.jpg 225w, https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/underlying-pigment2-2-350x129.jpg 350w, https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/underlying-pigment2-2.jpg 1167w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>Notice how the underlying pigments range from dark red to palest yellow. This is because pheomelanin is tougher to remove, so when a client tells you that their hair &#8220;lifts warm,&#8221; you can assure them that that is the case for everyone!<\/p>\n<p>When hair is coloured, the underlying pigment will affect the formula based on whether you want to neutralize or enhance these warm pigments. For example, does the client desire a cool chocolate brown hair colour or a more golden-brown hue? You will then use the colour wheel to create an appropriate formula.<\/p>\n<p>When going darker with a low-level developer, the underlying pigment will not be exposed, but you still must consider the existing tone of the client\u2019s hair when formulating for the desired result.<\/p>\n<h1>Hair Condition<\/h1>\n<p>When consulting with a client, you must also assess the condition of the hair. There are three main characteristics to look at: <a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_205\">Porosity<\/a>, <a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_207\">elasticity<\/a>, and <a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_208\">texture<\/a>. All three physical factors will influence which products to choose and how to process the colour.<\/p>\n<h2>Porosity<\/h2>\n<p>Porosity refers to the hair\u2019s ability to absorb moisture or chemicals. Porosity is influenced by how the cuticle scales sit in relation to each other.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-190 size-full\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/porosity-drawing.jpg\" alt=\"An enlarged diagram showing the porosity of three different strands of hair. Described in following text.\" width=\"639\" height=\"209\" \/><em><strong><a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_209\">Resistant Porosity<\/a>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_210\">Average Porosity<\/a>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <a class=\"glossary-term\" aria-haspopup=\"dialog\" aria-describedby=\"definition\" href=\"#term_40_211\">\u00a0Extreme Porosity<\/a><\/strong><\/em><\/p>\n<h2>Elasticity<\/h2>\n<p>Elasticity is the hair\u2019s ability to stretch and return to its original shape without snapping.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-200\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/elasticity.jpg\" alt=\"\" width=\"564\" height=\"299\" \/><\/p>\n<h2>Texture<\/h2>\n<p style=\"text-align: center;\">Texture refers to the diameter of the hair strand and is generally described as fine, medium, and coarse.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-195\" src=\"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-content\/uploads\/sites\/329\/2021\/01\/diameter-1.jpg\" alt=\"Cross sections of fine, medium and coarse hair strands.\" width=\"605\" height=\"214\" \/><\/p>\n<p style=\"text-align: center;\"><em><strong>Fine\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Medium\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Coarse\u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/strong><\/em><\/p>\n<p style=\"text-align: left;\">With these basics fresh in your mind, let&#8217;s move on to how the various colouring products work, and how to decide which product is best for the client.<\/p>\n<h3>Media Attributions<\/h3>\n<ul>\n<li>All images in this chapter are by A. Magtiza and are under a <a class=\"internal\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY 4.0 Licence<\/a>.<\/li>\n<\/ul>\n<div class=\"glossary\"><span class=\"screen-reader-text\" id=\"definition\">definition<\/span><template id=\"term_40_201\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_201\"><div tabindex=\"-1\"><p>The outer layer of a hair strand made up of overlapping scales.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_40_202\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_202\"><div tabindex=\"-1\"><p>The second layer of a hair strand, which provides hair with its strength and elasticity.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_40_203\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_203\"><div tabindex=\"-1\"><p>The inner core of a hair strand, which gives hair its structure. Often missing from very fine hair.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_40_204\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_204\"><div tabindex=\"-1\"><p>Pigment that resides in the hair's cortex which gives hair its hue.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_40_192\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_192\"><div tabindex=\"-1\"><p>Any pigments that are exposed as hair is lightened through the 10 levels of lift.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_40_205\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_205\"><div tabindex=\"-1\"><p>The hair's ability to absorb moisture or chemicals.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_40_207\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_207\"><div tabindex=\"-1\"><p>The hair's ability to stretch and return to its original shape without snapping.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_40_208\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_208\"><div tabindex=\"-1\"><p>The diameter of the hair strand. Texture can be described as fine, medium, or coarse.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_40_209\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_209\"><div tabindex=\"-1\"><p>Hair that does not readily absorb moisture or chemical products. Cuticle scales are tightly packed and smooth.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_40_210\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_210\"><div tabindex=\"-1\"><p>Hair absorbs moisture and chemical products at a common rate. Cuticle scales are intact and slightly raised.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><template id=\"term_40_211\"><div class=\"glossary__definition\" role=\"dialog\" data-id=\"term_40_211\"><div tabindex=\"-1\"><p>Hair readily absorbs moisture and chemical products. Cuticle scales are lifted and\/or damaged.<\/p>\n<\/div><button><span aria-hidden=\"true\">&times;<\/span><span class=\"screen-reader-text\">Close definition<\/span><\/button><\/div><\/template><\/div>","protected":false},"author":90,"menu_order":2,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-40","chapter","type-chapter","status-publish","hentry"],"part":26,"_links":{"self":[{"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/pressbooks\/v2\/chapters\/40","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/wp\/v2\/users\/90"}],"version-history":[{"count":3,"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/pressbooks\/v2\/chapters\/40\/revisions"}],"predecessor-version":[{"id":382,"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/pressbooks\/v2\/chapters\/40\/revisions\/382"}],"part":[{"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/pressbooks\/v2\/parts\/26"}],"metadata":[{"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/pressbooks\/v2\/chapters\/40\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/wp\/v2\/media?parent=40"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/pressbooks\/v2\/chapter-type?post=40"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/wp\/v2\/contributor?post=40"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/opentextbc.ca\/haircolourforhairstylistslevel2\/wp-json\/wp\/v2\/license?post=40"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}