Vermicompost and Lump Charcoal

I started vermicomposting recently and so far so good. I've read a little about biochar and it sounds almost magical. I have a used up bag of lump charcoal with some small chips and dust left over. Would adding this source of charcoal to my vermicompost bin give me a little biochar? Is there any reason not to add lump charcoal to vermicompost? I would not add briquettes, but lump charcoal is just burnt wood as far as I know.

Without seeing it, it's hard to say. There is some thinking around here that lump charcoal for BBQ use isn't "cooked" as fully as the char intended for biochar. This is on purpose, of course, to preserve some of the wood flavours that infuse your BBQ creations.

One source suggests you can tell the difference if you crush the char in your hands. If the carbon rinses off with water, it's fully cooked. If it takes soap to remove, there are other residues still present.

Personally, I doubt that's a deal-breaker for a regular composter. (Though I can't imagine paying for char by the bag!)

I'm not sure of the impact on worms in a smallish bin though.

I vermiculture in 20 l buckets. I throw in ashes from the fire that often contain the odd lump of coal. Of course it is a small quantity compared to the overall biomass and I mix it well with coffeegrounds and a little sand. The worms haven't complained yet