by Ember » Fri Dec 13, 2013 5:35 pm
Conte possibly better than charcoal.
I thought the graphite might be suitable for standing oil. I've seen a lot of concrete floors with quite a sheen to them, but it is hard to get the mix just right, I know.
I actually have a concrete floor that I made fora diorama (another that I must get back to) which was done with rock dust mixed with tinted plaster. Sanded smooth on drying it looks very real.