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  1. Do you mean if I fired at cone 10 reduction then it wouldn't be toxic as functional ware?
  2. Thank you everyone really appreciated. Soak time and slower cooling might be it. For 3rd tile I'm thinking ash or feldspar need to be reduced to get that grey color?
  3. Thank you. Seems soak and slow cool is the issue. 3rd one is 20 wood ash, 60 feldspar 20 local clay, i have not been able to get constant result of grey surface fired on test kiln and large kiln. I think I may need to reduce the amount of feldspar?
  4. Hi, I have a test kiln about 20*20*20 CM and a bigger kiln about 75*75*60. I use the same firing and cooling schedule on both but sometime on certain glaze I keep getting different result on test kiln. These glaze are ash clay felspar mixed glaze fired in electric kiln both test kiln and the other bigger kiln. Here some photos, the left test tile is fired by test kiln. I'm guessing firing too hot too fast? Or not enough gap for air? Please really need help to get this right Here is my firing schedule. 450° C 3hr @150° C / hr 1050° C 6hr @ 100° C
  5. Hi, I recently come across with flambe Jeff's red, it contains 4.4 barium. I've heard barium and copper may cause some toxicity issue for functional ware. Can anyone confirm and how much of barium is safe? Is Jeff's red not recommended for functional ware? Custer feldspar 41.9 Whiting 8.4 Silica 26.2 Gerstley borate 8.7 Dolomite 8.7 Barium carbonate 4.4 Zinc oxide 1.7 Tin 2.6 Copper carbonate 0.5 Bentonite 1 Thanks
  6. Hi, I plan to brush iron oxide as under clear glaze or over white glaze. How much amount of water do I mix them with and do I need to add slip with it? I'm totally new at this, how exactly do I mix it Thanks in advance
  7. Ya dual firing system is new in Taiwan many personal studio uses it to get a minor reduction effect. Its not as reduction as full gas kiln. I have the kiln at the entrance of my house, now I'm gonna move it outside of the house because this incident. Here is the link of the brand. Sorry its all Mandarin. Brand is Lonkai, they are leading brand for these dual firing kilns in Taiwan. http://www.longkai.com.tw/tw_products_detail.asp?Fkindno=F000001&Pidno=201205290001
  8. However there is a switch to fire reduction which uses gas to heat up at 1100 c, as well a venting hose sucks the air out. That hose suppose to be hookup to a hole on the door to vent out the air to the outside of the house. And I don't know what cause the odor, I will ask the manufacturer. Actually combine gas firing at which temperature can be programmed.
  9. The gas line didn't hook up gas tank. So electric powered up to 1200 c degree. Sure used a lot of electricity.
  10. And the animals are still there running wild freely.
  11. I'm not sure the cause of this smell. I was told by the manufacturer it is commonly occurs during the first firing. So he suggested to fire it to 1200 c on first fire.
  12. Hi everyone. I recently purchased a electric / gas dual firing kiln and was told to do a 1200 c firing to get rid of the first firing bad smell. I forget to switch it to oxidation firing and the venting hose was inside the house without me noticing until later on. It was fired empty kiln with just kiln shelves and stands. It was set to fire 12 hours and during the 4th hour I started notice bad smell and turn on the fans and windows and moved to safe zone. At 8th hour I notice the whole house is this smell and it stings my eyes. I probably inhaled 3 hours of these, might be lessor because i had
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