so quickly that by the time the mixture is fully stirred, it is still raw, and may not have
reached trace yet. If that happens, stir occasionally, by hand, until it starts to trace.
STEP 8: TRACE STAGE
Trace refers to the viscosity of the mixture as it is stirred; the term “trace”
originated from a method of testing the soap mixture. Take a spoonful and drizzle it
across the top of the mixture; if it remains visible, or leaves a trace, for a few seconds
before blending back into the mix, then the mixture has begun to trace. Light trace
refers to mixture that has just begun to thicken, whereas medium trace and heavy
trace refer to a mixture that is thicker and more difficult to stir. (Some recipes will
take longer to trace than others; humidity and temperature also affect tracing times.
If the mixture doesn’t trace as quickly as it should, don’t worry; keep stirring, and it
will eventually.) Most additives, such as superfatting oils, herbs or colorants, will be
added at the trace stage; once the soap mixture has reached this stage, the lye and fats
are about 80-90% saponified, meaning that anything added to the mixture will not be
significantly affected by the saponification process. Depending on the ingredients,
they may be added at light, medium, or heavy trace. Measure out the essential oils,
colorants, or any other additives you plan to use in a separate bowl. Mix a spoonful
of the soap mixture with the additives. When it is well-blended, add it to the soap
mix, stirring slowly and steadily as you pour.
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