Neema's Art Posted April 3, 2020 Report Share Posted April 3, 2020 I am making mugs with red clay which I fire to cone six. I apply white slip over it and scratch through. I have use both Amaco and Duncan cone 6 clear and both turn my red clay brown, sometimes even murky. Is there a recipe and/or a commercial clear cone 6 glaze that won't turn my red clay brown? Thanks neema Link to comment Share on other sites More sharing options...
Roberta12 Posted April 3, 2020 Report Share Posted April 3, 2020 What exact clay are you using?? My red clay always turns brown after glazing firing. I have been using Laguna RSMC cone 6 Roberta Link to comment Share on other sites More sharing options...
neilestrick Posted April 4, 2020 Report Share Posted April 4, 2020 Red clays will never be as red and rich when covered with a clear glaze, except with terra cotta. But at cone 6 and up it's the nature of the beast. It shouldn't necessarily be murky, though. That's due to the clear glaze. A clearer glaze may give you better color from the clay, but never as rich as the raw clay. Link to comment Share on other sites More sharing options...
Min Posted April 4, 2020 Report Share Posted April 4, 2020 Mug below made by D'arcy Margesson made from red lowfire clay. On the outside he has white slip (and slipped dots) which he carves through. Outside is a clear copper glaze, you can see part of it on the inside of the mug. Rest of the liner is made from a clear that is tinted amber. The tiny bit of iron in the amber glaze makes the bubbles that can cause hazing in clear glazes over red clay to dissipate. You could try the same process with your cone 6 clay, look for a commercial amber coloured glaze to try over the red part of the mug (liner glaze maybe?) or you could try experimenting with your existing clear glazes by adding a tiny bit of iron to it. I have used an altered version of this glaze as a liner on cone 6 red clay (vase below). I overexposed the image to make the inside of the pot show up better, no hazing. The Alberta Slip that makes up the majority of the glaze contains very fine black iron oxide, there is approx 0.60% of it, might be a place to start experimenting with. Link to comment Share on other sites More sharing options...
Rae Reich Posted April 5, 2020 Report Share Posted April 5, 2020 @Min That's a great solution! My first major glazing disappointment as a beginner was having to lose the beautiful rich red orange of earthenware when I had to glaze it. Subsequently, I thought that the usual dull brown would have to do. Thanks for the tip! Link to comment Share on other sites More sharing options...
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