Kombucha soap? Sounds interesting! I want to hear how that turns out.
Ruthie, my first batch of Kombucha soap was inspired by my SIL's love for Kombucha tea. She makes her own and drinks it all the time. Personally I hate the taste of the stuff, so I had to buy store bought in order to try it in soap. I wondered if anyone had ever tried using Kombucha in soap and as it turns out, I found a
recipe online at the NerdyFarmWife site. She provides her recipe and instructions for both CP & HP methods. I really liked the fact that I didn't have to alter the recipe since she doesn't use palm or lard, neither of which I wanted to use at the time, so that made it easy. I ran the recipe through SoapCalc of course and it made a change to the amount of lye (4.13 oz. instead of 4.14 ouces). I also changed the ratio of liquids she used and used to 2:1 Kombucha:water. Other than that, I kept it the same except in the end when it came time to pour the soap. Because I used the HP method it got pretty thick so I added 2 T yogurt & 1/4 cup cold Kombucha to loosen it up so I could pour it ino the simple loaf mold. I was able to unmold without any difficulty the next day, although my notes don't indicate how many hours that was. One would expect it would have been too soft, but it wasn't. I also don't have in my notes if I cut it when I unmolded it or if I waited and I just don't remember.
That was the first batch. For the second batch I added Borax to it because at that time I was experimenting with Borax as an additive to soap. 1.2 ounces Borax dissolved in 2 ounces boiling water, then cooled and added to the lye solution. I did not add yogurt to this batch as I was more prepared for how fast it would set up. Even though this one was quite thick and more of a scoop & plop, the 'HANDMADE' words in the mold are nicely defined. (Milky Way's Handmade slab mold.)
One thing the NerdyFarmWife does not mention is that because Kombucha is fermented it acts a lot like beer, i.e.; it is very bubbly like carbonated drinks. So IMO you should treat Kombucha tea the same as you do Beer in soapmaking. Therefore, I suggest letting it go 'flat' to decrease the likelihood of your lye solution roiling and rising up out of your container.
I've made it twice, but have no pictures, or I would include one. I didn't start taking photos of my soap until this year. I don't know why, just never thought of it until I decided to take a class. I do still have one left from one batch and a few from another. I should snap a pic before they are gone. They made very nice bubbles and lather.
In my notes I mention that it came to trace pretty quickly, so I am not sure I want to substitute pomace olive oil for the regular olive oil I used last time. I do have pomace, but used up all of my regular OO yesterday for the infusions. Maybe I will give it a try though and just not use the SB. Plus I want to do it CP method today instead of HP because it's already hot enough here.
Another fun thin about Kombucha is that the different flavors added to it lead to interestingly different colors of soap. Of the two batches I have made so far, one is a pretty dark sort of olive green color. The other is a very light pale almost celery green color, although I did use some fragrance in the lighter colored one (a small sample of Wild Mint & Moss), but the scent of the Kombucha is pretty strong on it's own and I don't think I had enough fragrance to come through.