Colouring

I got impatient and tried acrylic black paint. (Very small amounts)

then I bought proper pigment. all the photos of prep are with proper pigment. The acrylic caused a chemical reaction where it frothed over, the casts came out eventually but took forever to cure.

NOTE It is not recommended to use acrylic unless you are willing to risk your mould being ruined.

as a "happy little accident" the acrylic came out looking like concrete, it will be a great method of casting statues.

The pigment is STRONG. I am going to have another go using even less and try to get a grey. might need to use a little bit of white as well.