How to prepare your hair for a lab test

https://future-wiki.win/index.php/How_to_prepare_your_hair_for_a_lab_test

Before you head to the lab, skip the styling products for at least 24 hours—no gels, sprays, or oils. Wash your hair the night before with a mild shampoo, but avoid conditioners or leave-in treatments. Let it air dry completely, and don't brush or comb it afterward. If your hair is long, tie it loosely with a cotton scrunchie. Also, avoid any chemical treatments like coloring or perms for a week prior, as they can alter results. Bring a clean brush if asked to collect samples, but don't use it…