When coal-tar dyes were first introduced, the main ingredient caused allergic reactions in some people. The majority of hair dyes are now derived from petroleum. However, the FDA continues to classify them as coal-tar dyes. This is because they contain some of the same compounds as the older dyes. Dying.
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When dying your hair, remember the following safety precautions:
If you don’t have any signs of an allergic reaction, such as itching, burning, or redness at the test spot, you can be fairly certain that you won’t react to the dye when it’s applied to your hair. If you have an allergic reaction to the patch test, repeat the test with different brands or colors until you find one to which you are not allergic.
The most common error is making drastic changes to a single service. Hair color transformations should be gradual and not accomplished in a single session. Highlighting or balayage regularly causes breakage, mechanical damage, and hair shedding.
A minimum of 11 to 15 weeks should elapse between highlights and balayage. Root touch-ups can be safely redone every 2 to 8 weeks with any type of hair color.
Some studies have linked hair dyes to an increased risk of certain cancers. Other studies, however, have not discovered these links. However, keep in mind that most hair dyes are not subjected to the same safety testing as other cosmetic color additives before being sold in stores.
Cosmetic manufacturers have stopped using compounds that have been linked to animal cancer. However, some of those cancer-causing agents have been replaced by chemicals made in a similar manner. Some experts believe that the newer ingredients aren’t that different from the old ones. Also, read 5 Things to Avoid If Your Hair Is Thinning