SWIM has bought a testing kit including marquis reagent. SWIM is a little concerned about exposing himself to formaldehyde though as he has heard that it can cause cancer. Will the kit be safe to use once?
I was always more fearful of the concentrated sulfuric acid myself... i have burned holes in my clothes being a careless fuck with marquis... always make sure you wash testing stuff off with water. But I second the idea of not being an issue.