For all of my soap recipes I use 1 kg of oils (including tallow), the amount of caustic to react with the oils (a little less to allow for “superfat”) and about 330 mL of water. Someone asked me recently why I don’t specify an exact amount of water. I had to go back to my soap-making references to check where that ratio came from. Here’s some notes about how to work out how much water to use in a soap recipe.
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