Hi Soapers, Most of the resources I've looked at have said the only difference between PKO and PKO flakes is the convenience of the flaked form, but that the properties are the same. Although the Summerbee lye calculator lists both types, neither MMS nor SoapCalc do, which implies any difference is negligible. Have any of you noticed a difference, or found any resources that discuss it? I do recall one supplier saying the flakes accelerated trace - and of course I can't remember where I saw it. I probably didn't bookmark it because they had no better prices or info than other sites. Maybe they just said there was a diff to justify offering the solid form. Anyway, just curious. Cheers, j