I am trying to do a test where I put down a layer of black glaze or underglaze and then put a layer of white on top of it and have it appear as if the black weren't there at all. This is the most extreme case of a completely opaque glaze covering something below it. I am doing all my tests with a Frit Glaze at cone 06.
I have heard that I can simply do this by using 20% or 30% Tin Oxide in my top glaze, but haven't gotten satisfactory results. I even tried tests with layers of wax, Krylon spray, and gesso between the two layers in order to keep them separate. This however led to crazing, I believe because the two glaze levels were not about to bond with each other sufficiently. I found some interesting success by mixing the gesso directly with the top coat of glaze and I have heard of people also doing this with wax resist mixed into the glaze.
When layers of glaze are applied on top of each other, how much of the colors bleed together instantly versus when the glass formers are soft in the firing process? If some of the glaze layers are mixed into each other during application, does airbrushing on glaze reduce this at all? I would love to achieve my goal without having to intruduce a third firing stage between my bisque fire and final fire.
Am I barking up the wrong tree here? Any suggestions, comments.
c ya
John Rigler snipped-for-privacy@rigler.org