scalp and hair analysis
refers to the diameter of a hair strand
texture
The cortex is responsible for an estimated ____% of the hairs weight. This fibrous layer contains two important "ingredients" that make up the hairs color and strength: ________ +_________
90%; melanin and keratin
the study of substances that do not contain carbon and are not living or alive. Give an example.
Inorganic Chemistry
pure water, minerals, clean air, table salt, baking soda, lemon juice, batteries, iron, etc.
Mixing the three primary colors in equal proportions will result in what color?
black
application steps of virgin single process (going lighter with oxidative haircolor) and the width of a the subsections taken
mid shaft, roots-ends; 1/4 inch subsections
the amount of liquid the cuticle absorbs within a relative amount of time
porosity
The two types of melanin and what pigments they produce.
Eumelanin (brown to black)
Pheomelanin (yellow to red)
refer to materials that have a uniform and consistent composition, meaning they are made up of only one type of particle or chemical. Give an example.
pure substance
water, glycerin, vitamin c, citric acid, hydrogen peroxide, talc, alcohol, beeswax, etc.
Located within the visible light spectrum and contain minimal to no pigment of color.
(think of 'color schemes')
Neutral Colors
process of new hair growing out from the scalp that has not yet been chemically altered
new growth
Density is determined by the number of hair strands per __________ on the scalp.
square inch
True or False: Canities is absent of melanin.
True
These are used to neutralize acids or raise the pH; may be used in place of ammonia because they create less odor.
Are one part of a group of viscous, water-soluble amino alcohols.
Alkanolamines
Non-oxidative haircolor creates a _________ change; whereas Oxidative haircolor creates a _________ change.
physical; chemical
True or False: Temporary haircolor is made up of small, direct dye molecules that are unable to penetrate the cuticle of the hair, creating only a physical change to the hair.
False - large dye molecules not small
Average elasticity on wet hair can stretch to about ___% of its length.
True of False: Dry hair can be stretched up to 25% of its length.
50%; False - 20%
Acquired Canities is when the ____________ gradually become inactive.
melanocytes
An ingredient that is used to keep two incompatible substances together.
Emulsifier
What is the main difference between pure and compound hennas? And how are they similar?
compound hennas can have metallic salts within them, whereas pure henna will come "purely" from its plant leaves. Both can give uneven, unpredictable results.
The U.S. Food and Drug Administration and the _________ Act states that a patch test must be performed 24-48 hours prior to the haircolor service.
Cosmetic
When the combination of severe porosity on the ends with resistant or normal porosity on the mid-shaft is present.
Irregular Porosity
Gray hair can be divided into 3 percentages, which are:
0-30%, 30-60%, 60-100%
The pH range for hydrogen peroxide and lightener.
pH 2.5-4.0; pH 10.0-10.5
What are the two categories of lighteners and their subcategories?
on the scalp - oil, cream and powder
off the scalp - powder
The science and art of changing your guests current haircolor by adding or removing color.
Haircolor