Patch test; applying a small amount of product to skin to check for sensivity/allergic reaction to product/chemical; done in elbow or behind ear, 24-48 hrs before service, sit for 5 mins
Predisposition test
Periodic strand test; determines if hair color is absorbing/processing evenly
Processing strand test
Support tool for law of color to visually show how all color are created
Color wheel
System providing an understanding of color relationships
Law of color
3 basic colors (red,yellow,blue) from which all colors are produced
Primary colors
Created by mixing 2 primaries in equal proportions
Secondary colors
Created by mixing primary color with neighboring secondary color
Tertiary colors
Created by mixing primary and secondary color that are located opposite each other on the color wheel
Complementary colors
Hue; balance of colors
Tone
Contributing pigment; warm/cool tone seen within predominant hair color
Undertone
Strength of color’s appearance
Intensity
Middle layer of hair, made of elongated cells containing melanin and keratin
Cortex
Innermost layer of hair composed of round cells; hair missing this is fine/fragile
Medulla
Coloring matter that provides us with natural color of our hair and skin; pigment
Melanin
Produces brown/black pigments in hair
Eumelanin
Produces yellow/red pigments in hair
Pheomelanin
System used to determine light/darkness of a color
Level system
Degree of light/darkness of a color
Level
Grey hair; result of gradual melanin decline
Canities
Technique that allows for better hair color penetration by softening the cuticle; often used prior to coloring resistant/Grey hair
Presoftening
Science dealing with composition, structures, and properties of matter and how matter changes under the different chemical conditions
Chemistry
Substance used in/produced by chemistry process
Chemical
Study of living or previously living organisms containing carbon
Organic chemistry
Study of never living organisms that don’t contain carbon
Inorganic chemistry