I just stumbled across a portion of Scott Dooley's video "Handbuilding Modular Forms With Stiff Slabs" on YouTube. The segment concerns glazing the forms with black copper oxide and mason stains. He mentions that he uses a single glaze recipe to which he adds 10% colorant, but the segment doesn't include the recipe. In my work I can't use the primary intent of the video (modular forms) so I'd rather not buy the video for this one piece of information. Can anyone share his recipe?