I bought mine at my local health food store. Since I was only making a trial batch, I didn't want to buy a large quantity of it, so I bought a small bottle of Nature's Way Herbs Activated Charcoal in capsule form. The charcoal in the capsules was very fine and did not need any grinding at all. It was like talcum powder in consistancy. I found through measuring that 5 of the capsules equalled 1 tsp, which was perfect for my sample batch.
IrishLass