Rebatch – Double Boiler Method

Final2What you need:

Rebatching Soap Base (make it yourself or buy a premade base)
Fragrance or Essential Oil
Mold (the less detail, the better)
Optional: Herbs
Colorant (liquid works best)

Double Boiler
Large Bowl

RebatchM2-1Step One: Grate down the soap. katwOman recommended a SaladMaster so if you have one of these, you could try that as well. The key is to have small pieces of the soap. They mix in and soften up nicely (compared to trying to melt down an entire block).

RebatchM2-2Step Two: With the water in the double boiler burbling gently, place approximately 1 Tablespoon of liquid (water, tea, beer, wine) and the grated soap in the top pan of the double boiler.

RebatchM2-4Step Three: Stirring occasionally (every few minutes) for approximately 20 minutes, wait for the soap to soften into a gelatinous mass. Once it gets to a gloppy, thick oatmeal phases and looks sort of translucent, you know you’re ready. You can add more liquid but the more water or liquid you add, the softer the soap and more difficult to pop out of the molds.

RebatchM2-5Step Four: Stir in fragrance and color. I like to use approximately 1/2 ounce of fragrance or essential oil per pound of soap. Labcolors work best to color rebatch soap because they are easy to incorporate.

RebatchM2-6Step Five: Use a large spoon and glop the soap into any plain mold and gently tap the mold on the counter to get rid of any air pockets. The more detailed the mold, the more difficult it is to get the soap to easily release. You can freeze the soap if you’re in a hurry but it’s best to just wait it out if you can stand it. If you don’t like a more natural “back” of the soap bar, you can use saran wrap (below, right) to smooth out the backs of the soap.

That’s it – you’re done. You’ve completed a soap project in under one hour that can be totally natural and has a rustic and country chic look.


Like it? Share it!

Become an email subscriber

Enter your email address below and you will receive all our new posts directly in your email inbox.


  1. Ольга says

    Очень симпатичное мыло, не хватает сверху украшения из сухоцветов

    • says

      Спасибо! Мы любим добавлением трав и bontanicals нашего мыла, и вы можете проверить другие мыла у нас есть на этот блог, чтобы увидеть все варианты, которые мы использовали! :)
      -Бекки с Bramble Berry

      Thank you! We love adding herbs and bontanicals to our soaps, and you can check out the other soaps we have on this blog to see all the varieties that we have used! :)
      -Becky with Bramble Berry

  2. Patty says

    I rebatched a pound of the hemp soap base that I purchased about 3 or 4 years ago. It was very hard, so I added a little bit of vegetable glycerin to it as I melted it. It was hard to get to melt so after about an hour and a half, I used my stick blender and finally got all the pieces incorporated. The resulting bars are a little sticky. I wanted them for a gift soon, so I am experimenting… I put them on the racks of my food dehydrator and turned it on 80 degrees with the fan blowing. I’ve never done this before and wonder if the bars will get concave. Any one else out there ever try speeding up the “curing” process this way?

    • says

      Hi Patty!

      Normally when we are making a rebatch recipe we use a rebatch base ( or a cold process recipe that didn’t turn out how we wanted it to.

      Melt and pour bases don’t actually need to be rebatched. If they don’t turn out the way you like, you can just melt them in the microwave and try again!

      Unlike cold process, our melt and pour bases don’t need a cure time and are usable as soon as they harden up. If you are having problems with it hardening up, I’d suggest sticking it in the freezer for 5-10 minutes.

      I hope this helps!
      -Becky with Bramble Berry

  3. says

    Don’t worry! You probably haven’t ruined it. As soon as you can unmold it, cut it (if necessary) and let it sit for 6 weeks or so. It just needs some alone time to release some of that moisture! :) -Kristen with Bramble Berry

  4. Jody says

    Hi, I am having a little problem with a rebatch soap recipe. The original recipe turned out great, except I didn’t like the scent. I had infused lavender with olive oil and may have scorched it slightly, as the olive oil smelled kind of funny.

    I decided to try to rebatch. I grated it up, put it in my crock pot, and added (too much) water.

    The soap looked like it had thickened back up so I put it in the wooden mold.

    Apparently I added WAY too much water and now my soap is a purple soup-mushy mess.

    After about a week, I poured the soap soup into my stainless pot and cooked again. It appeared to thicken nicely, I added more EO and poured back into mold.

    This morning (8 hrs later) my soap is very wet in the mold.

    Is there any way to save this soap?
    It’s a 5lb batch I hate to lose, but I may have broke this batch beyond repair.

    How many times can a batch be RE-BATCHED?

  5. says

    2 questions…1. aloe melt and pour soap base…made into soap…can I rebatch …rebatched soap? I want to add grapeseed oil to it. 2. Can I melt a shampoo bar…to add grapeseed oil to it. I. Usually coat my hair with grapeseed oil about an hour before I wash my hair…I figure if its already in there…I can skip that step and have less mess. I’m thinking a tablespoon…or less will have to experiment cuz I still want the bar to be more on the solid side than the soft side. Thoughts?

  6. says

    Your probelm is totally fixable. I think we’ve all been there before too. It’s hard not to get color happy sometimes =)

    I would make another batch of cold process soap and leave it uncolored. Then you can rebatch the two soap loaves together and dilute the colorant by 50%.

    Here’s another rebatching tutorial:

    Embedding the soap chunks would be another great idea, Here’s a tutorial so you can see how we’ve embedded in CP in the past:

    I hope this helps, keep us updated! :)

    -Becky with Bramble Berry

    • Lila says

      THANK YOU for the help. I think I might to rebatch some of the soap, use some for embeds and also try saving some of the grated colored soap to put into plain soap to see what it would look like. So now I have 3 options to use up this over-colored soap. Thank you Becky for taking the time to respond.

      • Lila says

        Becky –
        I should have also asked, in my thank you reply, how long do I have to rebatch the soap? I know that as it continues to cure it loses moisture and hardens, so I should probably grate it as soon as possible, right? But if can’t get to it for another week or two, will this be a problem? Does it matter where I store the rebatching soap – cool or warm location?

        Lastly, I made two different recipes of over-colored soap, one is a shea butter recipe that I was dying to try out. To keep this recipe true, I should probably use the same recipe to make my plain rebatching soap? Otherwise, does it matter chemically if the plain soap and the over-colored soap are different recipes with different ingredients, or should they be the same recipe/ingredients?

        I greatly appreciate your patience and time.

        • says

          Hi Lila!

          You can actually rebatch CP soap anytime after it has hardened. If it seems a bit crumbly or dry, just add a little extra water to your recipe. Just remember, the more water you add, the longer it will take to dry.

          When rebatching, it doesn’t matter if you’ve waited a week or five weeks, as long as the soap has hardened, you can rebatch it. We usually suggest storing all your soap in a place that is around room temperature, anything too hot will make your soap start to sweat.

          It doesn’t matter if your plain soap and over-colored soap are different recipes, you can totally mix them if you’d like! :)

          Let us know how it turns out, Happy Soaping!

          -Becky with Bramble Berry

    • Lila says

      On April 25, 2012 I had asked you folks at Bramble Berry about how to rebatch soup that had too much colorant in it. You answered a number of postings with questions that I had and I am now updating you on the rebatching. I made a batch of basic noncolored, nonscented soap. After that soap had set for about 10 days, I grated it and made the rebatch soap – half colored soap/half plain soap.

      I wish I had melted the plain soap first and then SLOWLY added the colored soap – “slowly” meaning a small amount at a time because the colored soap was soap heavily colored that now I have a batch of less heavily colored soap but still too heavily colored to easy by itself. So if anyone has this problem in the future, the obvious thought is not to assume that a 50%/50% ratio will resolve the problem. NO! Try 95% plain/5% over colored and cautiously add from that point. When you said that the soap would be soft depending on how much liquid I put into the rebatching process, you were right! I actually finally just took it out of the molds (which is not like me to leave soap in a mold for several weeks, but I just couldn’t face the mess of a batch and my work hours have increased). The rebatched soap is soft – a little stiffer than playdough, it holds its shape but can be reformed fairly easily, and I was cautious about the amount of liquid I added.

      I am only writing to you because I want others to learn from my mishap! I am going to use the rebatched soap as imbeds and try felting some of it when it hardens more. It was a great learning experience and still will be as I try felting later on, something I have been curious about trying. Thanks for your help and advice. Happy soaping!

  7. Lila says

    Anne-Marie –

    I am looking for info on rebatching CP soap that I added way too much colorant in. It was my first time coloring soap and I didn’t see the color in the soap at trace that I liked so like a dummy I added more colorant. Now the soap is so dark and I tested the soap using gloves to lather it up thinking that the colorant would run out and possibly make a mess as a person used it. Sure enough, the bubbles have the dye color in them and I ended up with thickly colored lather on my gloves and water going down the drain. I’d like to basically dilute the batch I made with another full batch.

    Please help me, I can’t find any help online for this scenario. I thought about using the soap for embeds or grating it and just stirring some of it into a fresh batch of soap at trace just to add some different embed (for lack of another term) look to some soap. The soap has been curing now for about 7-10 days.

  8. mythicrose says

    Can soap that never hardened be rebatched? And what if I mix it with soap that got too hard (crumbly)? And one last question, can soap be too old to rebatch?

  9. Pam Douglass says

    Hello, I received my noodles a few days ago and I am not sure how to use them, this is my first time. I see that you use very little liquid, my question is, is it okay to use some other oil such as Evening Primrose or vitamin e oil?
    Pam D.

    • says

      If you’re using soap rebatch base, then you don’t need to use very much liquid because our soap rebatch base is made fresh.

      However, if you’re using another vendor’s base, you’ll want to confirm with them how much they want you to use.

      Different rebatching bases act very differently =)

      You could use Evening Primrose Oil or Vitamin E oil (though Vitamin E is so thick, I’d prob go with EPO).

  10. Nadia says

    I can’t wait to try this myself! But I was just wondering, what material are the molds made out of, and where can I buy them?

  11. says

    You are correct – if you add more liquid to your soap, it will be smoother. But it will take longer to harden up too so there’s a trade off.

    The cracked look on top of the soap is more than fine – it’s rustic! =) And the soap will work exactly the same.

  12. Terri says

    Hi Anne-Marie i was worried that my rebatch soap wasn’t smooth enough to put in the molds, then i saw your picture of the purple soap (above) Some rebatch soap looks smoother, is it because they added more liquid to their rebatch. Is that cracked look on the top of the soap ok?

  13. Shorty says

    If you dont have a double boiler like the one shown in the photos, would it be possible to just use a pan with a glass (heat-proof) bowl on the top?

  14. aromagik says

    Thanks, Anne-Marie! I hadn't seen the video and it was very helpful. I had the heat set to medium high, but I was using a makeshift double boiler (big aluminum bowl over big stainless steel pot) so that was probably a big part of the problem. I've got it cut and drying, so I'll be interested to see how long it takes to harden up. Wish me and my spongy soap luck!

    Thanks again! :>]


  15. Anne-Marie says

    Great questions, Lindy. Have you seen this Soap Queen TV episode?

    What temperatures are you using and how long are you cooking? It sounds to me like you need to let it cook a little bit longer, on higher heat with a little more liquid (regarding the first batch). And remember the more liquid you add, the longer the rebatch will take to harden up

    Your spongy batch should be just fine. Cut it and get it on the curing rack to dry out =)

  16. aromagik says

    I hope someone can give me some tips. I used the double boiler method with 2 lbs of shreds (luxury rebatch formula from BB), and added 1-2 (maybe 3) tablespoons of water (started with one, definitely seemed like it needed more). It never got to the translucent stage, even after 45+ minutes on the stove. I added FO, which seemed to cool it maybe a little too quickly, then scooped and pushed it into a loaf mold. It got hard almost immediately, and when I unmolded it the next day it was crumbly. So I decided to try it in the double boiler again. I chopped it up and used a lot more water this time, because it was looking too dry again and not seeming to come together. I also used a splash of fractionated coconut oil (thinking maybe that's what it needed). I molded it when it looked like mashed potatoes — it never did look like vaseline, but it looked as smooth as it was going to get. Maybe I took it off the heat too soon, but I was afraid I was overcooking and drying it out again. I'm pretty sure I used too much water the second time. Now it's very spongy in the mold. The last time I tried to rebatch, it never got hard (and I hadn't used much water at all) — it stayed spongy. Do you think this batch can be saved? How can I tell how much water to use, for future reference? Also, should the DB be over high heat? Medium heat? Low? Or doesn't it matter? Thanks in advance for any help. :)


  17. Anne-Marie says

    Since I always line the mold, I pull it out as soon as it's hard (1 day or so) and let it air dry for a few days before I cut it.

    If it's an individual mold, don't be surprised if you need to leave it in there for a couple weeks and even freeze it to get the soap out. Depending on how much moisture you put into the soap, it can be awfully squishy wet =)

  18. Anne-Marie says

    Yes, coloring with pigments or any other all-natural colorants is difficult. However, we do have several pigments that are ground up finely and put into liquid form so you could definitely use those and stay with pigments/oxides. They can be found here:

    Not all of them utilize oxides and pigments(the orange comes to mind) so read the descriptions to make certain they're the colorant you want.

  19. RedSunflower Designs says

    I've just started working with rebatch soap, and find coloring it can be difficult. I want to be sure my soap is all-natural, so using LabColors is out. What would you recommend using as an all-natural colorant for rebatch?

  20. Anne-Marie says

    Hi Melanie – The Sweet Almond Oil that Tina is using is in place of the water so she's adding it in the beginning. It will make a more creamy lather.

    The double boiler that you'd need for 4 pounds of soap … I'd go with a double boiler that held AT LEAST 8 cups of water. The soap starts out super puffy and fluffy because of the grating.

    Have fun with it!

  21. Melanie says

    Oh, and one more thing. What size double broiler (2 qt?) does one need to rebatch 4 lbs of soap? Thanks again!

  22. Melanie says

    Hi Anne-Marie, thanks so much for the post. I'm new to this. The Almond oil that Tina mentioned, is that to be used instead of the water in the beginning or is it just an additive somewhere later in the process? Thanks again!

  23. Anne-Marie says

    With labcolors, what you see is what you get. So if it's diluted labcolor, I'd start with 1/2 tsp per pound of soap but if it's undiluted, start with just 10 drops and work up from there.

    Yes, .5 oz. of EO per pound is a great place to start (that might even be a little strong).

    Sweet Almond, I wouldn't use more than 1 oz. for the 2 pound size.

    Yes, some people do add dry milk at the very end of the rebatch process. I wouldn't do more than 1/2 Tbs per pound, so no more than 1 Tbs for the 2 pounds you have.

    Thanks for your business! =)

  24. Tina says

    I just got my rebatch in today and am so excited and ready to soap!!! Just a couple of question for you, first- how much of the labcolor should I use per 2lb? Second- 1 oz of EO per 2lb, right?! And third (lol)- can I add almond oil to this and if so how much would be recommended for the 2lbs? I also read where people added dry milk to rebatch, is so when and how much? Okay, finally done!! lol =)

  25. Anne-Marie says

    Yes, since there is no lye involved in this rebatching process, any LabColor will work.

  26. Anonymous says

    Do you use labcolors for CP soaps when you color rebatch soap? Or will any labcolors work? Thanks

  27. Anne-Marie says

    While you don't need to wait 4-6 weeks for the soap to "cure" or become safe for use, you may want to wait the 4-6 weeks so the excess liquid used in the rebatching process evaporates out. Soap that is soft tends to disappear in the shower more quickly than soap that is hard (with less liquid left in it).

  28. Ana says

    Thank you so much for the tutorial, I've learned so much from you! :) and I love purchasing my supplies from Bramble Berry.
    Rebatching soap is so easy but do you still have to wait 4-6 weeks for the soap to cure?

  29. Anne-Marie says

    That's an awesome tip. I'll have to find one of those for future grating if I ever have blocks. Though … (shhhh), we're just getting ready to introduce pre-grated rebatching soap at Bramble Berry for the same price as what our blocks come into now. That should make things way easier and less time consuming for customers.

  30. Michelle says

    A Saladmaster is AWESOME for grating – did a whole 2lb block in under 2 minutes. I completely forgot I had one until rereading this post. We had a Saladmaster party about two years ago and recieved it for free for being the hosts. Not saying someone should host a party to get one for free, but that's why we did it!

  31. Lisa @ Serah's says

    I think I may be adding Rebatch Soap to my next purchase from Brambleberry to experiment with. Thanks for the tutorial.

  32. Anne-Marie says

    Mary, You can rebatch soap that has fragrance in it already. You might find that the heat makes the fragrance disappear faster than you’d like so you might have to add more fragrance to your mix but other than than that little caveat, you totally can rebatch soap that’s been colored and fragranced already.

  33. Teresa R says

    Once again, I want to mention how much I love your step-by-step with-photos tutorials, Anne-Marie! You rock!!

  34. Mary @ Annie's Goat Hill says

    Can cold processed soap be rebatched that has fragrance or pigments in it already, or can we only rebatch a base?