Hello, I have started trying it to get a harder bar that is easier to unmold and has has less water to evaporate away during the cure. I learned about this at an advanced soapmaker’s workshop at the HCSG 2019 conference.

@@springcreekbathworks5738 - I use a 33%/35% Lye Concentration and 1 tea PPO Sodium Lactate and have had very good luck. Did they explain in this advance class that there is more to curing than just water evaporation? I do a 8 week cure during Spring/Summer and a 10 week cure doing the Fall/Winter...some of it has to do with it being colder/damper, but mostly I like how the extended time makes for a much better bar of soap.