Other than being trendy, what are the benefits to salt bars? I know it makes the bar harder, but does it make the soap more beneficial for the skin? I have made salt bars using rebatch shreds, and the bars were very hard, but very little lather, and I didn't notice any exfoliation or improved conditioning. So before I embark on making CP salt bars, other than hardness, what are the benefits? Just for clarification, I'm talking about adding salt at trace, not to the lye water. Thanks for any info and opinions.