It made it a little bumpy, it depends on how much you use. Do some small batches an experiment until you get the look you want.

I have made some test batches and the softening salt thats in the rock will not disolve. I have had one piece soaking for 3 weeks to a month and still when i crack it in half there is undisolved salt. Salt that is 1cm from the outside of the rock and still it doesnt look the slightest bit disolved. Anyone else notice this ?