It is mostly on the ends of some bars, some don't have it. I did a tongue test, and no zap. I did not use palm oil. It happened on the bottom of the molded part, not the top, and i always cover with plastic wrap. Recipe... Pre-Creamed shortening 16 oz Lard 12 oz Corn oil 8 oz Canola Oil 8 oz Shea Butter 4 oz Lye 6.17 , discounted at 6% Water 12.30 oz, no discount It feels and looks very chalky.