Mistake No. 4: Skipping strand and skin tests Most people don't have allergies to bleach alone (though some are certainly more sensitive to it than others), but if you're using a bleach with color in it, patch testing is always important. A day before you apply it, make a small portion of the bleach mixture and do a patch test on the inside of your elbow or at the back of your ear. Wait for it to dry up and watch out for allergic reactions. As mentioned earlier, it's natural for the bleach to heat up. But if it stings too much and starts to burn, abandon the plan immediately and rinse with water.
When you do the patch test, go for a strand test as well. This way, you'll have a realistic idea of how the bleaching process will go.
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