What’s the texture?
This type of hair has the largest diameter and usually feels rough.
What is coarse hair?
Hair with a raised cuticle layer that easily absorbs moisture.
What is high porosity?
What phase signals the end of active growth?
Catagen phase
What part of the hair is visible above the skin?
The hair shaft
Hair is made of what natural protein?
Keratin
This texture has the smallest diameter and is more fragile. This texture requires lower heat.
What is fine hair?
The best way to test porosity.
Sliding fingers along hair strand from ends to scalp.
TRUE OR FALSE: Gray hair is coarser and more resistant than pigmented hair.
False
Layer of hair that provides strength and elasticity.
The cortex
Name the five main elements that make up hair.
Carbon, oxygen, hydrogen, nitrogen, sulfur (COHNS)
The number of hair strands per square inch of scalp refers to this.
What is hair density?
Chemical services performed on this hair porosity require a more alkaline solution.
What is low porosity?
Occurs when hair leaves the follicles at an angle and grows in circular pattern
Whorl
Pigment that makes the hair brown and black.
Eumelanin
What are three side bonds that affect hair strength?
Hydrogen, salt, and disulfide bonds.
This property determines the hair’s ability to stretch and return to its original length.
What is elasticity?
May have raised cuticle areas.
What is average porosity?
What causes oily hair and scalp?
Overactive sebaceous glands.
Elliptical cross-section
Very curly/coily hair
Which bond is broken by chemical relaxers?
Disulfide bond
This is the standard compared to other hair textures.
What is medium hair?
Over processed hair that looks dull and dry likely has thus level of porosity.
What is extreme (high) porosity?
A natural part is caused by two hair streams flowing in opposite directions.
Hair stream
Average hair density?
2,200 hairs per square inch
Nitrogen makes up about _% of the hair
17%