LovingMixedMedia group, Gary is hosting monthly techniques and this month he demonstrated a technique using bitumen (asphalt/tar). I used Chinese Sumi Ink and got close to the same results without the smell! Here is a photo of the first few steps. I'll share more pics soon.
If you are interested in learning from some super friendly and welcoming artists, join the main ning and look for the challenge group to join as well. Everyone is very helpful and encouraging. I hope to see you there, as I pop in occasionally!