I had another idea about how to colour the Gedeo resin plaster I use to cast my letters. I added a good whack of black acrylic paint to the mix, and things were looking promising until I'd waited three days for it to set and it still hadn't! So I gave it a week.In drying, the mix in the mould had shrunk a little, making the backs of these asterisks concave. However they did have an exquisite chalkiness which was pretty nice.
So chalky, in fact, that they just broke apart upon handling! What a shame.So. Concrete colourant it is. Watch this space!