Yes, that's true.Fresh soap yes. But the soap you use to make these forms won't be fresh. It will be at least three days old before it's used. Soap dough has already undergone saponification, it just hasn't hardened.
...But what confuses me is the recommendation not to leave soaps to dry and cure on metal shelves, especially aluminum. Wouldn't this apply to soap dough?
Thank you very much for this complete answer. It has cleared up my confusion.First, we don't know if the maker's soap is fully saponified when it's cut and placed on a rack to cure. It might be mostly done, but even that last 1-2% of saponification will react with aluminum and cause it to deteriorate. I can show you one of my aluminum cookie sheets as proof that freshly made soap can deteriorate aluminum. (Soap that I thought was fully saponified, but obviously wasn't)
Second, it takes weeks, even months, for soap to cure, so soap on metal racks is exposed to that metal for a long time. Soap is fairly sensitive to going rancid from exposure to metals and the longer the soap is exposed, the greater the chance to develop rancidity. Some metals such as iron and copper are especially bad. Even if the rack is coated with paint or other covering, metal ions can migrate through these coatings and trigger rancidity in the soap.
You're going to be using soap dough that's older so it's more likely to be fully saponified. Also the soap dough is exposed to the aluminum tool for only a short time -- minutes to hours, not weeks to months. Your situation is low risk compared to curing soap on metal racks.
Haha I also bought it specifically for watermelon seedsFully saponified soap dough, for sure. I love mine, although I haven’t found many uses for it yet. Currently, I use the disk that looks like a rain drop to make black seeds for my watermelon soap, but that’s all.
I sure wish I could find other disks so I could use it more…..
ETA - just found them on ETSY
Do NOT mention this to our husbands, LOL!Haha I also bought it specifically for watermelon seeds
I am totally stealing this!DH: "Honey, is my heat gun in your soap room?"
ME: "No, but MY heat gun is there, and you are welcome to borrow it... but bring it right back when you are done with it."
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