Himself has been busy having a go at colouring the rocks I cast using real pieces of shale from Wales.
The picture doesn't quite do them justice, I have to say.
He dry brushes them with acrylic paints starting with a range of greys and then adding other colours to pick out the details.
There is still more work to be done on the examples in the picture above but it gives you a flavour of the work he's doing.
I was comparing one them with the piece I used for the master and, as I held one piece in each hand, I became genuinely confused about which was the casting and which was the genuine piece of rock.
(It didn't occur to me to turn them over and see which was flat - and still white coloured - on the back)