How to add the pigment into the silicone rubber to get colorful moulds?
Generally speaking, the silicone rubber has two kinds, tin cure (condensation cure ) silicone and platinum cure (addition cure) silicone rubber. And the part B of both kinds are the hardner.
Usually, the pigment would be added into the silicone part A. But what we should pay attention to is that the platinum cure silicone rubber is very sensitive, and the heavy mental or the impurities can make it uncured easily. So pls do make sure the pigment is suitable for silicone rubber.
Then, how many to add？
If for the tin cure silicone rubber, add about 2% pigment into the silicone first (100g silicone, 2g pigment.) stir them evenly and then add it into the rubber base.
If for the platinum cure silicone rubber, add about 0.2%~0.5% pigment into the silicone part A first (100g silicone, 0.2g~0.5g pigment) stir them evenly and then mix it with the silicone rubber base.
Of course, you can adjust the addition of the pigment according to the different shade you want.
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