See these paintings at Glitch, 48-49 Old Market St, Bristol BS2 0EX
Oil and bitumen on board 60 X 60
Bitumen paint is made to repair a leaking roof. It is dreadful stuff to work with, sticky, stinking and as black as can be. It is like the dregs of a barrel of crude oil, but when dried on a painting it can be a sublime, rich, and deep black. Pure black like Japanese lacquer, but with a velvety softness.