Oregon Barber License (practice test for board exam) 2023

uticle Outer most layer of the hair. It consists of a single, overlapping layer of transparent, scale-like cells that resemble shingles on a roof. It protects the inner cortex layer and contributes to 20% of overall strength of hair. The Cortex The middle layer of the hair. A fibrous protein core formed by elongated cells containing melanin to pigment. Gives hair majority of its strength and elasticity. A healthy Cortex contributes to %80 to the overall strength of the hair. Contains melanin that determines hair color. The Medulla The innermost layer of hair. Sometimes absent from hair and doesn't play a role in hair coloring. composed of round cells. Texture The diameter of an individual hair. Density The number of hairs per square inch. Porosity The hairs ability to absorb moisture. Low porosity The cuticle is tight. The hair is resistant (difficult for moisture or chemicals to penetrate. Thus, it requires longer processing time. Average porosity The cuticle is slightly raised. Hair is normal and processes in an average amount of time. High porosity The cuticle is lifted. The hair is overly porous and takes color quickly (also fades quickly) Permed, colored, chemically relaxed and straightened hair will have a high degree of porosity. Mixed melanin A combination of natural hair color that contain both pheomelanin and eumelanin. Basal cell cercinoma Most common and least severe type of skin cancer; often characterized by light or pearly nodules.