"Depends on who you talk to," Childermass says without one damn hint of worry. Apparently, Lambert's warning either doesn't hold water to the man or he really does think he can handle it (which he does, actually, but that'll be the surprise). He catches the bottle Lambert slides his way and takes a moment to hold it up, get a good look at it, before giving a sort of half-shrug to himself — like saying 'all right, whatever' without actually saying it — and opens it.

Less goes into his drink than he saw Lambert pour into his own, of course. He'd been told the necklace can only handle so much poison and, with it hidden away as it is, he can't exactly keep an eye on it for any dangerous color changes.

"Used for alchemy how, if I might ask?"

Sure, he's about to drink literal poison, but he's also still going to carry on with the conversation casually as he closes the bottle again and slides it back to Lambert. It's only after that that he'll drink the rest of his whiskey, White Gull and all.