Hair dye is a product used to change the color of hair. It is typically made from a mixture of chemicals, including ammonia, hydrogen peroxide, and dyes. Hair dye can be permanent, semi-permanent, or temporary. Permanent hair dye changes the color of the hair shaft permanently, while semi-permanent hair dye fades over time. Temporary hair dye washes out after one or two shampoos.
Hair dye does have an expiration date. The expiration date is typically printed on the packaging of the hair dye. After the expiration date, the hair dye may not be as effective and could cause damage to the hair. It is important to use hair dye before the expiration date to ensure the best results.
