The term rebatching for soap simply means remaking soap. This method would be very similar to melt and pour soap in that you are melting down soap that has already gone through the saponification process. Rebatching is more intricate than melt and pour soap though. Rebatching involves cold processed or hot processed soap bars that are melted down for specific reasons.
A common technique used in soap making, rebatching allows many soap making handcrafters the chance to rework their soap recipes, introduce delicate scents and herbs, as well as add ingredients or colors they may have missed the opportunity to add the first time.
Since rebatched soap has already gone through the saponification process, the rebatching steps do not involve lye. This is why rebatching allows the opportunity to add those delicate soaping ingredients; without fear. With the rebatching method, these ingredients; which normally would not survive the saponification process, now have the chance to add wonderful benefits to your finished bars of soap.
Although time consuming, the rebatch process is fairly easy to do. To put it briefly, the rebatching process is finely grating the soap, then heating (sometimes with the addition of a liquid like water to help prevent burning). There are a few different ways to introduce heat to the shredded soap. These ways would include: double boiler, microwave, and crock pot. But, please advise: you must monitor the soap while it is heating because you never want to scorch the soap. This may be slightly more difficult using the microwave approach.
Now, as the soap is heated and starts to liquefy; it will have a very thick gel like density. Once the soap hits this consistency, any additives or scents are added and stirred in. Once the soap is stirred well, it is then scooped into a mold, left to harden, and finally cut into slices.
So, now that you have an understanding as to what the method of rebatching is, we will shortly post a blog as to the various reasons to rebatch. This post will also cover the benefits as well as the drawbacks of rebatching your soap.