Always work in a well ventilated area. We recommend that you use Color Remover with a Respirator Mask using Gas/Vapor Cartridges especially if you have allergies or asthma as this product has been known to aggravate those conditions.
To prolong shelf life, store in airtight container in a cool place. Exposure to moisture and heat makes it go bad. It will gradually turn yellowish if it has gone bad. When in doubt, test!