Mark C. Posted June 2, 2015 Report Share Posted June 2, 2015 OK this is arare event-a glaze in magazine that turns out exactly as in the book. I was reading last months CM (ceramics monthly) and saw a iron glaze that caught my eye So I mixed it up as a sample in 1,000 grams and tried it in a reduction fire to cone 10 and a half It also works cooler as well in a cone 9 area of the kiln-slow cooling=more cystals WOW it turned out eactly as in the photo-now thats a rare thing folks. Heres the recipe out of May CM issue Its credit goes to emerging artist Alex Thullen-not sure if its his creation? Iron Crystalline glaze cone 11-12 Oxidation Synthetic bone ash----12% Talc------------------------9 Whiting--------------------9 Custar Feldspar---------48 EPK Kaolin----------------6 Silica (325 mesh)--------16 ----------------------------100% add Red Iron Oxide(synthetic)-11.5% I suggest using these exact ingredients for best results get some high purity iron and the right bone ash most should have the rest lying around in the studio You can see his photo on the May issue page 87 Heres some of my work after a few more fires using this glaze and mixing up a 10,000 gram batch one last note this stuff will stain your clothes if you get it on them-I use glaze clothes every week but many may not have a set-you will after working with this one you will have a set. Mark PS could a moderator please move this to the glaze forum as I posted it in wrong space-thanks Link to comment Share on other sites More sharing options...
Marcia Selsor Posted June 2, 2015 Report Share Posted June 2, 2015 Wow Mark! That is a beautiful glaze. Marcia Link to comment Share on other sites More sharing options...
synj00 Posted June 2, 2015 Report Share Posted June 2, 2015 Cooling and heating speed are variables that most folks dont really want to play with (me included, but I'm coming around) but you've proven that it is a valuable tool to have in the box. This is beautiful! Link to comment Share on other sites More sharing options...
Benzine Posted June 2, 2015 Report Share Posted June 2, 2015 Is that all one glaze, or do you have a second glaze next to it? It kind of looks like a low fire, commercial "Freckled Brown" I use in my classroom. It's one of those rare colors, that both myself and my students like. Link to comment Share on other sites More sharing options...
Mark C. Posted June 4, 2015 Author Report Share Posted June 4, 2015 Is that all one glaze, or do you have a second glaze next to it? It kind of looks like a low fire, commercial "Freckled Brown" I use in my classroom. It's one of those rare colors, that both myself and my students like. The mug on right has one glaze on it (the Iron crystal) the bowl is many many glazes but the iron one is down the middle (the reddish color) Its all cone 10 reduction glazes Mark Link to comment Share on other sites More sharing options...
Wyndham Posted June 10, 2015 Report Share Posted June 10, 2015 Mark it looks like a great Ohata red. hard to tell but are there flitter iron crystals? Maybe a close up if you could. Gotta try this in next firing. Thanks Wyndham Link to comment Share on other sites More sharing options...
Mark C. Posted June 10, 2015 Author Report Share Posted June 10, 2015 This is the nicest Ohata red I have ever used. Mark Link to comment Share on other sites More sharing options...
Min Posted June 11, 2015 Report Share Posted June 11, 2015 Gorgeous iron red Mark! I'm wondering what peoples thoughts are on using iron reds inside bowls, mugs, plates etc. I love iron reds but don't use them much since they always seem to be short on silica and alumina in order to get that drop dead gorgeous colour. I know there isn't much concern with iron leaching, for most people, but I have some concerns over the durability of them. The recipe Mark posted from Alex Thullen is a lot better than most I have seen. At ^6 I've yet to try one with silica and alumina as high as these and still get red. Not trying to stir the pot, just open to peoples thoughts on this. Link to comment Share on other sites More sharing options...
Mark C. Posted June 11, 2015 Author Report Share Posted June 11, 2015 This glaze seems to be tougher (scratch resistant) than any of my True reds (copper) or say a cobalt blue base. My other Iron glaze I have used for decades is also very durable.I have some iron reds on stoneware that has lasted for 4 decades as well. I cannot speak to cone 6 as I have less than zero experience there. Mark Link to comment Share on other sites More sharing options...
earthfan Posted June 11, 2015 Report Share Posted June 11, 2015 In Australia we call this glaze 'tomato red' even though it is unlike the red of a tomato. I read somewhere that the red colour is iron phosphate made by the combination of phosphorus from the bone ash and iron in the iron oxide. Does anyone know? Link to comment Share on other sites More sharing options...
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