Mixing ratio recommended no higher than 5% pigment to total weight of silicone, higher quantities may result in cure inhibition.
Pigment can be used with condensation cure & addition cure silicones. Mixing pigments into a while silicone base can result in lighter shades of the colour intended. e.g black pigment will become grey / dark grey. For optimum results we recommend using these silicone pigments with translucent or non pigmented silicones bases.
If you are purchasing silicone with a pigmented catalyst you will need to purchase a clear catalyst as the coloured catalyst will have an obvious effect on the silicone pigment.
Image above is a guide only.