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Chapter 16 Hair Structure
When coloring hair there are many things to consider. Match each of these terms with its definition.
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Density
the number of hairs per square inch
Texture
diameter of a hair strand
Porosity
ability to absorb liquid
Low porosity
cuticle is tight; hair is resistant and takes longer to process color.
Average porosity
Cuticle is slightly raised; hair is normal.
High porosity
Cuticle is lifted: hair is overporous and absorbs color quickly.
Eumelanin
melanin that gives black/brown color to hair
Pheomelanin
melanin found in red hair
Cuticle
outer layer of hair; gives hair 20% of its strength
Cortex
Middle layer of hair; gives it elasticity and 80% of its strength
Medulla
inner layer of hair
Contributing pigment
pigment under the natural hair color
