Cold Process Soap Recipes

How to Rebatch Soap in the Oven

ugly soap
They can’t all be beautiful, I guess.

I messed up a soap recently…I purchased a salad shooter and made the mistake of soaking my soap shreds before adding them to my soap. Of course, they turned to mush and looked awful in the soap. I shouldn’t have added them at all (another case of I should have gone with my gut, but didn’t). I decided it wouldn’t sell looking like that, so I’d better rebatch it. I had only had to rebatch soap once before – I used the crockpot and it got really dried out, so I wanted to try a different method. After reading through the Bramble Berry guide to rebatching, I decided to try the oven method at the bottom of the tutorial.

I had two loaves of this disaster soap, but after cubing up one loaf, I realized only one loaf would fit in my baking dish. So I did one loaf at a time. With the first loaf (3.2 pounds), I added a cup and a half of water (which is about 1/2 C per lb of soap).

This is less than the tutorial recommended, but I felt like 1 cup per pound of soap was an awful lot of water.

rebatch soap
Cubed soap ready for rebatching.

Turns out, even the amount I used was too much water. I froze the soap the next day to get it out of the mold, but it’s been sitting on the counter for three days and it’s still very soft. *sad face*

So the next day, I rebatched the second loaf using only a half cup of water total. This one turned out much better. So, here is the process, all laid out:

Rebatch Soap in the Oven Tutorial

Step 1: Preheat the oven to 200 degrees.

Step 2: Cut your problem soap into cubes and place them in a baking dish.

Final result.
Final result. It looks like hot process, huh?
Step 3: Add 2.5 Tablespoons of water per pound of soap.

Step 4: Cover your dish with foil.

Step 5: Bake soap for 35 minutes, stir and bake an additional 35 minutes. Stir again.

Step 6: At this point the soap is going to be the texture of hot process soap. You are now ready to add color and/or fragrance to your soap and scoop it into your mold. Be prepared to work quickly. Just like hot process soap, rebatch soap likes to get firm quickly. You could add a little sodium lactate to the melted soap to keep it fluid for a little longer.

I still froze the soap the next day to get it out of the mold, and then let it sit overnight. I was able to cut it the following day with no issues. One day later, the bars are softer than a regular bar would be, but I know it will harden up soon. The first batch…time will tell. That one might get pitched.

rebatch soap top
I added glitter for good measure. And that’s Layla (she’s being super needy and won’t let me take a photo without her).
Notes: My soap was only a few days old when I did my rebatch. That may be why I only needed 2.5 Tablespoons of water per pound of soap. If your soap is fully cured, or even older than that, you might need more water than this. I haven’t tested it, so I don’t know for certain, but it does seem logical.

Who else hates to rebatch soap? Do you have a better method? Please, share it in the comments!

3 thoughts on “How to Rebatch Soap in the Oven”

  1. Debra,I would put it in a shallow, wide mouth cotenianr and use it with a scrubbie if it is not quite a solid, but not really a liquid. After all of that work I would not throw it out, especially if you like the lather. Also you could just put some more essential oil in and mix it up so you have the fragrance your going for. I have just boiled it down on the stove, by passing the crock pot, if I get too much liquid in the mix, in the past. Once you are at the re batching stage you don’t have to worry about the chemical reaction part of the equation so much as all of the lye has been used up.My goal in life is re use, re purpose or do without as much as possible anyway. Hope this has been helpful to you

  2. I recently made Pine resin soap using Pinon Pine resin from Jenny’s soap. This Pine resin is totally refined and very clean. Upon making my soap during the trace it got very clumpy and gritty to the point when I put it in the mold it’s stayed clumpy and gritty. After about a week I took it out of the mold and the soap was very moist and soft still. I cut up the pieces into small squares and use the double boiler method. I am currently heating it up with just a little bit of water and a teaspoon of sodium lactate.

  3. I actually like rebatching, it’s the same as having a milled soap. I once rebatched some soap three times, the final product was great with a rich lather. It does make a harder soap. I feel like I have more control on the final result, even if the texture doesn’t look smooth. I usually wait 4 to 6 weeks before shredding it in the Cuisinart (it’s the same as shredding hard cheese), put it in a large casserole dish with 2 Table water per pound to start. It’s ok to smush it down, but don’t compress it too much. Cover with foil, and bake in a 250 oven. After 30 minutes, stir, add a little more water if dry, cover and bake another 30 minutes. Stir, add color and scent, if desired, and spoon it in the molds….it doesn’t pour well. Voia, it’s typically good to use the next day. I’ve never done this but I suppose you could use a hand mixer to get more consistency, but it does cool very quickly. I like the idea of a double boiler….good idea for next time. Rebatching also uses less scent. So give your funky soap a new life.

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