I thought I replied to you on this issue, but I don’t see it here....maybe it was on a different thread? So I apologize if this is a repeat, but I use fine Himalayan salt in all of my salt bars with no scratches, no cuts, and no problems. I buy the big plastic containers of it from Costco.Well now theres an expensive mistake lol. I made (2) 12 bar cavity molds of them lol. And they are so pretty and smell so good.. And they later so well already. But i dont want to babysit them for 8+ more months if i cant use them.