I made four different kinds of soap:
- pure tallow: 6 oz water, 2.2 oz NaOH, 16 oz tallow
- tallow + coconut oil for more cleansing lather: 6 oz water, 2.3 oz NaOH, 13.1 oz tallow, 2.9 oz coconut oil
- tallow + coconut + a mix of oils left over from another project: 6 oz water, 2.3 oz NaOH, 12 oz tallow, 2 oz coconut oil, 2 oz oil mix (coconut and almond oils, beeswax)
- shaving soap (one batch with NaOH and one batch with KOH): 12 oz water, 3.4 oz KOH, 2.3 oz NaOH, 4 oz glycerin, 9.6 oz stearic acid, 20.8 oz tallow, 1.6 oz oil mix (coconut and almond oils, beeswax)
To create the shaving soap, I mixed the NaOH and KOH batches together to get a good texture. Stearic acid is too hard to use NaOH only, but not hard enough to use only KOH, which is meant for creating liquid soap. This is called a dual-lye soap.
One batch of attempted soap boiled over and was lost ): I pre-melted the oils and they got too hot, so that when I added the lye-water, it boiled immediately, forming a lye volcano. Fortunately, no one was injured (except the crock pot, whose paint is a little corroded…).
Hot-process soap is a little gloopy when it’s done, so it can be hard to put into molds. You can mix in additional water to improve pourability, but the soap will have to cure longer to reach the desired hardness.
Until next year!