Cold-Process Soap
Plain-English, source-cited guides to cold-process soap chemistry.
Guides
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Lye calculator basics: SAP values
Saponification values, why every oil needs a different amount of NaOH, and how superfat changes the number.
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Superfat and water, explained
What superfat (lye discount) and water amount actually do — the three ways to express water, and how each affects your bar.
Trace: Soap & Lye Calculator
A cold-process soap calculator with cited chemistry: SAP-based lye and water for any oil blend, superfat, quality bounds and fragrance caps that name their source, plus a multi-batch cure tracker. No subscription, no ads, no scanner, works offline.