Froufrouis Posted May 30 Report Share Posted May 30 Heyy I‘m pretty new in ceramics and recently found out that you could add Silicon Carbide to certain glazes to mimic a reduction firing atmosphere. I used this to make a fake celadon glaze with iron oxide. This made me wonder if you could use this with porcelain to get the kind of porcelain that has a greyish blue hue, that you can only get when fired in a reduction atmosphere. I was just wondering, and I know that this is possibly a bad idea, as silicon carbide can also lead to pinholes or more… But I‘m still intrigued, if anyone has tried something like this please let me know! Thanks and have a great day! Greetings from Austria!👋 Quote Link to comment Share on other sites More sharing options...
Min Posted May 30 Report Share Posted May 30 Hi and welcome to the forum. Image below from Derek Au where he ran some tests doing this. On my computer screen it looks more gray with the additions. Froufrouis and PeterH 2 Quote Link to comment Share on other sites More sharing options...
PeterH Posted May 30 Report Share Posted May 30 A few refs on how local reduction in glazes seems to work. I'm inclined to feel that the mechanisms don't apply to local reduction of (most?) bodies. I suspect that silicon carbide needs to be in really intimate contact with whatever it's reducing. Usually this seams to mean in contact with the liquid glaze. BTW the mesh-size of the silicon carbide can also affect the results. In general pottery suppliers usually sell a coarse mesh. An interesting paper on copper reds, which covers a wide range of local reduction issues. https://tomturnerporcelain.glazy.org/downloads/CopperRed_35DE.pdf Min and Froufrouis 2 Quote Link to comment Share on other sites More sharing options...
Froufrouis Posted June 1 Author Report Share Posted June 1 On 5/30/2024 at 6:17 PM, Min said: Hi and welcome to the forum. Image below from Derek Au where he ran some tests doing this. On my computer screen it looks more gray with the additions. Ohhh wow thanks for the reference!! Hulk 1 Quote Link to comment Share on other sites More sharing options...
Froufrouis Posted June 1 Author Report Share Posted June 1 On 5/31/2024 at 12:11 AM, PeterH said: A few refs on how local reduction in glazes seems to work. I'm inclined to feel that the mechanisms don't apply to local reduction of (most?) bodies. I suspect that silicon carbide needs to be in really intimate contact with whatever it's reducing. Usually this seams to mean in contact with the liquid glaze. BTW the mesh-size of the silicon carbide can also affect the results. In general pottery suppliers usually sell a coarse mesh. An interesting paper on copper reds, which covers a wide range of local reduction issues. https://tomturnerporcelain.glazy.org/downloads/CopperRed_35DE.pdf Yeahh regarding the coarsnes of the Silicon carbide, i had to grind it down for some time, until I was happy! Will do some tryouts with that too! Thank you for the paper! I will definitely look into that! Best regards! Hulk 1 Quote Link to comment Share on other sites More sharing options...
PeterH Posted June 2 Report Share Posted June 2 Might it be worth trying (atmospheric) reduction in a saggar? PS As it's porcelain perhaps aluminium foil saggars aren't suitable: Quote Link to comment Share on other sites More sharing options...
Min Posted June 2 Report Share Posted June 2 I wonder if it would be easier to slurry mix some stain with porcelain to get the colour. You would probably loose a bit of translucency but it might be worth a test. Quote Link to comment Share on other sites More sharing options...
Jarman Porcelain Posted June 2 Report Share Posted June 2 I'd second adding a little stain instead. Much easier and no off gassing to worry about I'd also suggest asking yourself why it is so important to mimic reduction fired porcelain? It is something I chased for years, when I finally gave up and decided to focus on making a better oxidation porcelain I found something I'm really happy with. An imitation will always be just that, you'll always be looking past the good pots in front of you because they aren't something else. Kelly in AK and PeterH 2 Quote Link to comment Share on other sites More sharing options...
Kelly in AK Posted June 3 Report Share Posted June 3 On 6/2/2024 at 7:41 AM, Jarman Porcelain said: An imitation will always be just that, you'll always be looking past the good pots in front of you because they aren't something else. Powerful wisdom in these words. Thank you. Jarman Porcelain 1 Quote Link to comment Share on other sites More sharing options...
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