I have searched the website but the only results given were for epoxy, Polyurethane and Polyester. Anyone has any idea for this?

We don't at present stock any pigments for silicone rubbers. The reason being that our silicones are generally intended for mould making rather than being the finished object, so there is little need for pigments.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant