Ethically sourced Cobalt oxide 500g for use in ceramic glazes and enamelling. Powerful dark blue colouring. I've used this in glazes as an ingredient and as brush decoration mixed with some water - it works great. The picture is a test tile which I’ve brushed on in equal measure a cobalt oxide from my local ceramic suppliers (on top) and the cobalt oxide I am selling (bottom). As seen there is very little difference in appearance and almost no difference in the quality of colouring (if anything the cobalt oxide I am selling appears more potent). This is the real deal, I’m able to sell it cheap due to having an excess. I can’t find it cheaper anywhere else.