Margi:
Most Scandinavian companies did a version of the bubble vase. Kosta might have been the first with Pippi, that's off the top of my hedr, but iitala, Aseda, and a quite a few others, including some recent non Scandinavian companies, also had versions.
I know it's a bubble, not charcoal. Sorry, I didn't explain myself very clearly. I mean the interior of the vase was coloured charcoal.
Come to think of, that's not a bad idea, putting charcoal in.
David