Notes on CPOP, from another soapmaker :
I switched to CPOP at that time, whichstands for Cold Process Oven Process. It is kind of a hybrid in the sense that you can use the soap the same day, similar to Crock Pot process. Whatyou do is mix up your batch as if you were making Cold Process. Pour it inthe mold. Set the mold in a very LOW heated oven, usually the 170 degree.Put the wooden mold (yes, don’t use plastic unless you know it can withstand180 – 200 degree temps, just to be safe) with soap mixture in the oven andleave for 4, 6, 8 hours. I used to make my CPOP soap at about 10 PM afterthe baby was in bed and the adolescents (including the husband) were in bedor cleared out of my kitchen, my then soap making space. I would put mycouple of molds of soap to ‘bed’ in the warm oven and just go to bed. In themorning, I would take them out, let them cool until about noon, then sliceand rack them. You can use them immediately, but they will harden up somemore with some rack time to let them evaporate any excess moisture out.For me, the CPOP was the best of both the Hot Process world and the ColdProcess world. Once I had a large area dedicated to soapmaking, that Icould prevent kids, cats, and hubby from traipsing around in, I switchedover entirely to just regular CP..
In CPOP soap after the soap reaches trace and any colors, fragrance, or additives are mixed in, it is poured into an oven-safe mold and put in an oven that has been pre-heated to 170 degrees. The oven is left on for an hour. After that hour, the oven is turned off and the soap is left in the oven for another 11- 12 hours.
So why do CPOP? Well one of the common obstacles with CP soap is the curing time. It can take anywhere from 4-12 weeks (depending on the kind of soap) to cure. So if you need CP soap for a quick gift or need extra bars for a show, you’re out of luck unless you already have some made. With oven process, it cuts the cure time down and speeds up saponification. Instead of saponification taking anywhere from 24 hours to a week, It only takes 12 hours. Also, some of the water in the soap evaporates out while in the oven so depending on the type of soap, it can cut the cure time by as much as 2 weeks (again it depends on the type of soap). How cool is that???