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A soak test starts with a cup test. A piece of the cured silicone is broken down into smaller pieces, which are sealed into a container for 24 hours with a small amount of alcohol. The alcohol is decanted off and a strip of white paper or coffee filter is dipped into the alcohol, removed, and allowed to dry.  A second strip is dipped into clean alcohol and also allowed to dry under the same conditions as the first. The strips are then compared under bright light for any change in color from dye or pigment leaching. It is possible for some minor staining to be seen from silicone oils, and this can be ignored as these oils are safe.

This test should be performed when using any mulled pigments, lake dyes, or when staining of the mold has been observed.

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