Most of the Hair coloring products contain potentially harmful ingredients.

These chemical ingredients may cause skin, eye, and throat and lung irritation and could also lead to the cancer of the bladder.

Hydrogen Peroxide

The chemical is used to strip away the natural color of the hair before dying. The chemical is said to change the hair structure and makes the hair brittle which removes the natural luster of the hair

Ammonia

This chemical is used to open the hair’s cuticle i.e. the outer layer of the hair in order to allow the dye to reach the inside of the hair i.e. the shaft. This can cause caustic burns or irritation to the skin

Parabens

Parabens are a class of widely used preservatives in cosmetic Methyl parabens and Propyl parabens are common paraben preservatives that are widely used in hair care products and can produce severe allergies and skin irritation.

Lead Acetate

May cause neurological problems and can also cause anemia. The chemical is used as a color additive to add a darker shade.

Resorcinol

It is another chemical that is used in hair dyes and can cause scalp irritation and this allergen can also affect the endocrine system.

DMDM hydantoin

They are usually used as preservatives and can increase the risk of cosmetic dermatitis in consumers allergic to formaldehyde

Consumers need to decide whether or not to use permanent dyes.

http://www.dailymail.co.uk/health/article-18662/Hair-dye-cause-cancer–brunettes-greater-risk.html