I have seen a few pipes in The Briary's collection that had tar oozing out the pores of the briar. Then cut in half, the tar had penetrated the walls, but not in an easily photographed black from wall to chamber, but like black pin lines.
But, I was also in there one day when a guy brought his pipe in for Skip to look at. He wanted to know what was wrong with it. It has black puss shooting out of the birdseye side of the briar. The guy said he never touched the actual briar. He was a clencher that compulsively only touched the stem before and after smoking, meanwhile, while smoking, he absolutely never touched the briar. It was the tars shooting out like a black puss filled zit. It was gross, but kind of cool.
I was just as amazed at the guy's claims to have never touched the briar. He just told me that when you take the pipe out of your mouth, your not smoking. You light it, and smoke. That's it. Big burley dude, with hands like whole hams and a jawline like an ethnic crimeboss...
"But what if someone wants to talk to you about..."
"If you take the pipe out of your mouth, you're a pussy."
"Ohhhh kay." end of conversation. ha ha.