Is it ok to use hot wax on face? Lady at the salon says it’s ok as long as it is chocolate wax. Since I don’t get to see what wax gets emptied into the container, I wanna know if there is a sure-shot way of finding that out. Same question for hair color as well. How do you tell if it is ammonia free or PPD free etc? Not all salons are ok opening the pack right in front of you.