Hair Dyes and Hair Colors are products intended to impart color to the hair. Hair dye ingredients have been extensively tested over many years and have been found to be safe. This is established through the testing of individual dying ingredients as well the other ingredients that are used to formulate the products. In addition to ensuring the safety of the individual ingredients, hair dyes are assessed to make sure that are not irritating or cause an unusual incidence of allergic reactions. The FDA requires that hair dyes bear a caution statement and appropriate “patch test” instructions for determining whether the product causes skin irritation in the user. It is very important to follow the directions on the label and to only use these products in a safe manner. Link to FDA discussion about Hair Dye products. The quality of Hair Dyes and Hair Colors is established through rigorous Quality Assurance and Good Manufacturing Practices. Finally, the safety of products is monitored in the market-place through reports of consumer comments and complaints. Companies include a phone number on their products where comments or complaints may be reported. A related topic of interest includes Lead Acetate.