- Jan 12, 2022
- Reaction score
I have had quite a few sticky, stringy M&P attempts, early on when my recipes were on the oleic side. More or less to find out the hard way, that the only way to get nice and hard M&P soap is to lift hard oils way beyond what I'd be comfortable with for regular bar soap.
This makes perfect sense when you think about it: in regular soap, the saturated FAs from the hard oils have to support the unsaturated FAs from the soft oils (to form a solid bar that doesn't dissolve too quickly) – but in M&P, they also have to take care of the ton of sugar, glycerol, propylene glycol (or whatever solvents you're using).
What is the Sat/Unsat ratio, or the hardness number of your recipe? My regular bar soap recipes are usually around H=25…40, but with M&P I find that H must be above at least 55.
Fun fact for everyone: Sat/Unsat = 1/(100/Hardness-1)
@ResolvableOwl Thanks for the wisdom! I started a separate thread here if you want.
I used 80% hard oils and 20% castor oil! Here's the recipe I tried:
80g castor oil
56.83g lye (5% superfat)
123g distilled water (2.25:1 water:lye)
I didn't see anything recommending against this, so I also added 3/4 tsp sodium lactate and 3% citrate, because I normally add those to every HP recipe
Cook: 3 hours (both recipes I looked at said 3 hours, which surprised me--It takes less than an hour for HP! Sounds like a long cook makes the salts smaller and easier to suspend in a translucent soap.)
After the cook:
Break up soap and gradually dissolve in 60g glycerin and 185g alcohol (This part took me 4 hours in the crock pot, longer than I expected, but I worried about evaporating alcohol with too much heat and used Keep Warm instead of Low) *I'm using ethanol; I know that'll evaporate when I remelt because of its low boiling point and leave me with more opaque bars; I'm ok with that.
After soap dissolves:
Pull out undissolved soap bits, then stir in fully dissolved sugar syrup--114g sugar dissolved in 71g water.