A patch test, also known as a sensitivity test, is performed to check for allergic reactions to hair dye. It involves applying a small amount of dye to a small area of the skin and observing for any adverse reactions, such as redness or itching, before proceeding with a full application.
Allergic reactions to hair dye often result in symptoms like itching, redness, and swelling at the site of application. Dry skin and hair loss may occur for other reasons, but itching and redness are more indicative of an allergic reaction.
Disinfectants are used to kill harmful microorganisms, such as bacteria and viruses, on tools and surfaces to prevent the spread of infections. They are crucial for maintaining hygiene and safety in a barbershop.
he sebaceous glands are responsible for producing sebum, an oily substance that lubricates the skin and hair. Sebum helps to keep the skin moisturized and provides a protective barrier.
The cortex is the middle layer of the hair shaft and contains the melanin pigments that give hair its color. The medulla is the innermost layer, while the cuticle is the outer layer that protects the cortex. The follicle is the structure from which the hair grows.
