haircoloring chapter 21
DESCRIPTION
Haircoloring Chapter 21. Draw the three layers of hair. CUTICLE CORTEX MEDULLA. Three layers of hair. - PowerPoint PPT PresentationTRANSCRIPT
Cuticle – Outermost layer, Protection, Scale-like, 20% strengthCortex – Middle layer, gives strength, contains melanin, 80 % strengthMedulla – inner most layer, sometimes missing in fine hair.
~ TEXTURE TEXTURE- The diameter of a single hair
strand COARSE HAIR– LARGE DIAMETER
Takes longer to process, most resistant MEDIUM HAIR – MEDIUM DIAMETER FINE HAIR – SMALL DIAMETER
Processes faster, less resistant
DENSITY Hairs per square inch Thick hair or thin hair? The thicker the hair the thinner the
sections
POROSITY The ability of hair to absorb liquids
High porosity Cuticle highly lifted, damaged, rough Hair takes or processes faster
Average porosity Normal – healthy hair Slightly raised cuticle Average/Normal processing time
Low porosity Cuticle very tight, smooth, shiny More resistant, takes longer to process
ELASTICITY
The ability of hair to stretch without breaking
Hair should stretch __50___ % of it's length
“Pull Test” is used to test elasticity of hair