It is found in dark hair dyes - concentrations of up to six per cent are legal - and is easily absorbed through the skin on the scalp and the hands. Research has shown that people who use ...

Food dyes are generally safe to eat, but some people may be sensitive ... A mild reaction can result in symptoms such as hives, flushing, or itchy skin. A severe reaction can cause swelling ...

dry skin. Read more: Toxic chemicals in your home could be linked to cancer, autism, and reproductive issues. Here are 4 of the most concerning. Azo dye, found in blue jeans, can be carcinogenic.