No, it is not oily. As with any hand chalk, it may get "funky" in some circumstances - such as doing push-ups on a dirty floor with sweaty hands. We recommend you wash your hands before chalking.
Primo is very light and fine. This helps it perform and stay on your hands. The downside is that it will be messy if you use loose chalk carelessly. You really only need a pinch or two for a whole session. We recommend using our chalk balls and bucket topper to reduce mess even further.
Yes, we add super fine epsom salt, clove, eucalyptus, cinnamon, rosemary and lemon essential oils to our magnesium carbonate.
Yes, we use and independent lab to verify that our magnesium carbonate is free from heavy metals and dioxins. Primo starts with clean and verified safe magnesium carbonate and then we make the magic happen.