LeeU Posted December 2, 2017 Report Share Posted December 2, 2017 I have three relatively small pieces of Troy Wood Fire clay cone ten, already bisqued at cone 5, and glazed with cone 10 glazes in prep for a recent wood fire. Unfortunately, the pieces did not make it into the only wood fire that I had access to, and I am not likely to access another one anytime soon. I also won't be filling my electric kiln with cone 10 work. So...what is the worst that might happen to the glaze if I fired these glazed pieces to cone 5? The pieces are decorative and not for food. Should I just ditch them (don't really wanna do that)? Should I wash off the glaze and leave them just bisqued (hey look OK)? Or should I just go ahead and electric fire them at cone 5 with the glaze and see what happens? Link to comment Share on other sites More sharing options...
Sheryl Leigh Posted December 2, 2017 Author Report Share Posted December 2, 2017 My opinion.... wash off the glaze and reglaze with a ^5 glaze. I've tried to fire ^10 glazes at ^5/6 temps and it looked a lot like what you might find in a diaper .... Link to comment Share on other sites More sharing options...
Biglou13 Posted December 2, 2017 Report Share Posted December 2, 2017 1 hour ago, LeeU said: I have three relatively small pieces of Troy Wood Fire clay cone ten, already bisqued at cone 5, and glazed with cone 10 glazes in prep for a recent wood fire. Unfortunately, the pieces did not make it into the only wood fire that I had access to, and I am not likely to access another one anytime soon. I also won't be filling my electric kiln with cone 10 work. So...what is the worst that might happen to the glaze if I fired these glazed pieces to cone 5? The pieces are decorative and not for food. Should I just ditch them (don't really wanna do that)? Should I wash off the glaze and leave them just bisqued (hey look OK)? Or should I just go ahead and electric fire them at cone 5 with the glaze and see what happens? I'm thinking. Wild stab here. Re bisque piece to hold glaze. Save piece till next wood firing. Another thought the Troy clay( I understand my recipe a derivative of) is pretty reactive with out glaze, so washing is an option. but even washing will leave some residue of original glaze. Did you mean bisque at 5 or 05? Link to comment Share on other sites More sharing options...
LeeU Posted December 3, 2017 Report Share Posted December 3, 2017 bisqued them at 5--guess I'll wash it off and do the reglaze with 5--thanks all Link to comment Share on other sites More sharing options...
Biglou13 Posted December 3, 2017 Report Share Posted December 3, 2017 20 hours ago, LeeU said: bisqued them at 5--guess I'll wash it off and do the reglaze with 5--thanks all curious why they were bisque fired at such a high temp? Link to comment Share on other sites More sharing options...
Sheryl Leigh Posted December 16, 2017 Author Report Share Posted December 16, 2017 On 11/30/2017 at 11:31 AM, Guest JBaymore said: A guess...... lighter ash deposits, more "flashing", and less really "gnarly" crusty pieces. But that is totally a guess. best, ..................john It's true, there wasn't as much ash deposit as I would have liked to see, but everyone was very happy with how their work came out, so there's that. For the next firing, I was told that we needed to take the heating period much slower in order to get a good ash deposit and then go for the melt. Still not "gnarly", I guess, but interesting, I hope! Link to comment Share on other sites More sharing options...
LeeU Posted January 20, 2018 Report Share Posted January 20, 2018 Is there any significant downside to bisque firing high fire pieces at cone 5, to prep for a cone 10 wood fire. I don't want to have to fill a kiln with low fire ware (which I don't usually make) just to get some pieces ready for a wood fire. I've done it before and did not discern any ill effects--but whadda I know?! Link to comment Share on other sites More sharing options...
Sheryl Leigh Posted January 21, 2018 Author Report Share Posted January 21, 2018 Hmmm - I guess it's fine, but it seems like over-kill to me. There's some notable potters who don't even bisque prior to a wood fire, but their breakage levels might be a bit higher, too. Link to comment Share on other sites More sharing options...
LeeU Posted January 22, 2018 Report Share Posted January 22, 2018 It is a community kiln and bisquing work first is a requirement. Well, it finally dawned on me that I really just need to make enough work for wood firing in general to fill up my kiln for a biscuit run. I was trying to save money, but if I want to participate in wood firing, I best get over it and get on with it. DUH!!!! Why didn't I think of that before posting ? LOL Link to comment Share on other sites More sharing options...
Sheryl Leigh Posted January 22, 2018 Author Report Share Posted January 22, 2018 No "duh", you just had to come 'round to it! Link to comment Share on other sites More sharing options...
curt Posted January 22, 2018 Report Share Posted January 22, 2018 If you are going for reduction effects in your wood firing, particularly reducing the clay body for toasty browns, reds and oranges, then firing to cone 5 in oxidation first will tighten up the body too much. Body reduction really takes place starting at around 800 C up to the point where your glaze ingredients get a good melt happening ( at which point body reduction is pretty much over and glaze reduction begins). Bisqueing to around 1000 C still leaves the body open enough to achieve good reduction effects for most clays. In addition, your clay body will likely no longer absorb glaze slop when fired to such a high level. It will be hard to glaze pots which are essentially already vitrified. Unless your clay body is crazy refractory, then Cone 5 is not really bisque firing - it is more like a full stoneware firing. as someone asked above, are you really talking about cone 5? Or cone 05? Huge difference. If cone 05 then ignore pretty much everything I have said here... Link to comment Share on other sites More sharing options...
LeeU Posted January 25, 2018 Report Share Posted January 25, 2018 Yep...I was firing my cone 10 clay for bisque at 5 because I didn't want to have to fill a kiln for a low fire. Curt..thanks for explaining. I'm looking forward to the next anagama firing in April. Link to comment Share on other sites More sharing options...
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