CactusPots Posted February 25, 2020 Report Share Posted February 25, 2020 Got this from the Glazy site Iron Man Cone 10 reduction Custer 50 Silica 34 Whiting 16 Looks good so far, but yellow iron oxide 16 I know the YIO isn't strong, mostly clay. I just don't do enough kitchen stuff to be much concerned with the concept of food safe. I usually just use a white liner for everything. Link to comment Share on other sites More sharing options...
liambesaw Posted February 25, 2020 Report Share Posted February 25, 2020 Yep, food safe. Nothing in there that would ever harm anyone. Within acceptable limits of lead and cadmium, so dinnerware safe! Link to comment Share on other sites More sharing options...
neilestrick Posted February 26, 2020 Report Share Posted February 26, 2020 @CactusPots Please specify firing temp when posting glaze recipes. If that's a cone 10 reduction glaze, that's potentially too much iron. Without any clay in the recipe, you might have suspension problems. The iron is only going to help to a degree. Link to comment Share on other sites More sharing options...
CactusPots Posted February 26, 2020 Author Report Share Posted February 26, 2020 Sorry, yeah, I fire exclusively cone 10 reduction. I confused by this because yellow iron in my usage is not as strong as red iron. That's why I'm asking this question. Digital Fire says "Actual yellow iron oxides are around 85% Fe2O3 and about 12% LOI with some impurities (e.g. SiO2, CaO)." and Spanish Red Iron Oxide Oxide Analysis Formula SiO2 5.00% 0.153 Fe2O3 87.00% 1.000 Link to comment Share on other sites More sharing options...
Min Posted February 26, 2020 Report Share Posted February 26, 2020 Judging from your image this saturated iron glaze is precipitating out iron and forming crystallization. Going from the high silica:alumina ratio this should be an extremely glossy glaze and yet from your test tiles it doesn't appear to be, this would be due to the iron crystallization. Low(ish) alumina content combined with the iron crystallization on the glaze isn't going to make a super durable glaze, I would expect there to be a colour / gloss shift with use over time. It's hard to tell but is that a cluster of pinholes at the top of the first test tile? Ingesting iron isn't a problem for most people, exception being those with hemochromatosis. I added firing info to your post for others who read this thread going forward. Link to comment Share on other sites More sharing options...
CactusPots Posted February 26, 2020 Author Report Share Posted February 26, 2020 Also, not my test tile, lifted directly from Glazy. I will run tests of my own of course in my next load, but that might not be for a while. Interesting color response from an iron saturate, don't you think? Link to comment Share on other sites More sharing options...
liambesaw Posted February 26, 2020 Report Share Posted February 26, 2020 11 minutes ago, CactusPots said: Also, not my test tile, lifted directly from Glazy. I will run tests of my own of course in my next load, but that might not be for a while. Interesting color response from an iron saturate, don't you think? Seems fairly typical of kaki style iron glazes to me Link to comment Share on other sites More sharing options...
Martin Webb Posted May 3, 2021 Report Share Posted May 3, 2021 I'm mixing cone 6 glazes and researching what is food safe or not. One thing that came up is Iron Oxide is a food coloring, E172! Link to comment Share on other sites More sharing options...
Hulk Posted May 4, 2021 Report Share Posted May 4, 2021 interesting! Iron Oxides - International Association of Color Manufacturers (iacmcolor.org) Link to comment Share on other sites More sharing options...
Min Posted May 4, 2021 Report Share Posted May 4, 2021 There are quite a few minerals that are used in ceramics that are also essential for humans. Don't want to get my minerals from my glazes though Link to comment Share on other sites More sharing options...
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