To the best of my knowledge it is from 100% smoking. I purchased the pipe used and it was already well colored - it has continued to color as I smoke it. Judging from the orifice stem (which appears to be original) the pipe is about 100 years old.Holy smokes! Is that 100% smoking, or was there some pre-coloration going on there?
Here's a Bacchus / Dionysus from my collection that is well colored also...