Tyler Miller Posted June 5, 2014 Report Share Posted June 5, 2014 I've been making up a pile of test tiles today (shino and ash glazes), and I was curious about whether I could just brush a streak of red iron oxide over a few of them.. My gut tells me that I need to add a flux to this sort of thing (I believe I've read that in a number of places), but I'm curious if the oxide alone would be stable after firing. If I do need a flux, what would work nicely? The same flux at work in the glaze itself? Up to now, I've just used underglazes, often RIO straightup, or fluxed overglazes like in Majolica. I've never painted on a glaze in high fire. Edit: I'll just try it and see. If it doesn't work, I'll add some of the glaze flux for the next round of tiles. Link to comment Share on other sites More sharing options...
Min Posted June 5, 2014 Report Share Posted June 5, 2014 Iron is a flux in reduction so I wouldn't add any flux to it. (I'm assuming your shino's and ash will be fired in reduction?) Link to comment Share on other sites More sharing options...
Tyler Miller Posted June 5, 2014 Author Report Share Posted June 5, 2014 Thanks, Min. I will be firing in reduction. I had a bit of a moment of uncertainty, worrying if it would melt sufficiently and then if the result would be stable enough. Testing will confirm I guess, but I'm glad to know it should work ok. Should have remembered iron oxide is a flux in reduction. I feel a little silly forgetting that. Link to comment Share on other sites More sharing options...
jrgpots Posted June 5, 2014 Report Share Posted June 5, 2014 Try brushing the RIO on first as well. Maybe one stroke under the glaze and one on top. I was amazed how differently they responded to the same glaze. But I know you already know that. Jed Link to comment Share on other sites More sharing options...
Colby Charpentier Posted June 5, 2014 Report Share Posted June 5, 2014 Iron is a flux in reduction so I wouldn't add any flux to it. (I'm assuming your shino's and ash will be fired in reduction?) An oxidation or neutral atmosphere will cause iron to flux also, as long as one fires hot enough. And I wouldn't worry too much about the surface with RIO over a glaze. Even when applied to a bare clay body, it does fine. Link to comment Share on other sites More sharing options...
neilestrick Posted June 5, 2014 Report Share Posted June 5, 2014 It will al depend on how thick it goes on. Too thick and you'll get a nasty matte wrinkly metallic surface. Too thin and it won't show up well. So keep notes on your water to RIO ratio and try several different applications. Link to comment Share on other sites More sharing options...
Babs Posted June 5, 2014 Report Share Posted June 5, 2014 Depending on your glaze it may not stay where you place it because of the nature of the glaze and the fluxing action. esp on vertical surfaces. Link to comment Share on other sites More sharing options...
Tyler Miller Posted June 6, 2014 Author Report Share Posted June 6, 2014 Thanks for the help! Firing tomorrow, I'll post results asap. Link to comment Share on other sites More sharing options...
Tyler Miller Posted June 7, 2014 Author Report Share Posted June 7, 2014 Just a quick update, the test tiles are posted to my gallery. Link to comment Share on other sites More sharing options...
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