olivequeen Posted June 19, 2020 Report Share Posted June 19, 2020 I made a few items with Navajo Wheel (no grog) cone 5. They were bisqued then I applied a cone 5 clear glaze. After they were fired they came out a dark grey. I was surprised (and disappointed!) because I thought they would be the red terra cotta color of the clay body. What did I do wrong?? Link to comment Share on other sites More sharing options...
liambesaw Posted June 19, 2020 Report Share Posted June 19, 2020 4 minutes ago, olivequeen said: I made a few items with Navajo Wheel (no grog) cone 5. They were bisqued then I applied a cone 5 clear glaze. After they were fired they came out a dark grey. I was surprised (and disappointed!) because I thought they would be the red terra cotta color of the clay body. What did I do wrong?? Is the bottom a dark red clay color? I don't know of any cone 6 red clays that will appear terra cotta colored, that's more of a bisque temperature color. What I'm going to guess is that the red clay caused a bunch of micro bubbles in the clear glaze making it appear gray. Link to comment Share on other sites More sharing options...
neilestrick Posted June 19, 2020 Report Share Posted June 19, 2020 From the pic I just looked at from the IMOC website, it looks like it goes fairly brown at cone 6, which is to be expected. With a clear glaze it will be more gray. If you want the red terra cotta color with a glaze over it, you have to work at low fire temps. FYI, the absorption rate of that clay body is 2.9% at cone 6, so it's not great for functional work. It is likely to absorb and weep moisture. Link to comment Share on other sites More sharing options...
Min Posted June 20, 2020 Report Share Posted June 20, 2020 @olivequeen, if you are looking for a brick red cone 6 clay Georgies Dundee Red might be worth trying, when I used it a few years ago it was definitely more red than brown. At cone 6 it's nice and tight so it's good for functional pots. There is a slight tooth to it unlike the Navaho Wheel red clay but they don't include that in the description. Imco has 2 smooth Navaho Wheel clays, one is the original one that used to fire to cone 6 but now needs to go to cone 8 which they call Navaho Wheel Regular the other is Navaho Wheel Classic which is the cone 5/6 version. If you make your own glazes try the Alberta Slip recipe here, the iron in the Alberta Slip helps clear the bubbles as does not having a high alumina content in the glaze. Link to comment Share on other sites More sharing options...
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