Pres Posted June 21, 2018 Report Share Posted June 21, 2018 As Mark has said, potter's choice about what to use or not. Myself, I have decided against anything in the shop that will have severe consequences for my own health. I know that my shop has a major hazard in dust, from silica. I do what I can, to keep that from getting too bad. At the same time I keep away from barium, lead, uranium, some other materials. Yes I use cobalt, chromium, and copper as coloring agents, and keep them in enclosed containers in a closed wall cabinet, carefully weighing them when mixing materials. Some may find interesting that in the 70's ran a Geiger counter through the Jewelry & Metal-craft studio and found several pounds of copper enameling enamels that were kicking the scale of the meter off the chart. These were commercially purchased in our regular purchase orders from reputable companies. Then the big materials safety in the studios hit, and there were major changes by manufacturers in what they used for coloring enamels, and what I got in the way of commercial glazes. Oversight is important at times, and guidelines do help us to make better decisions. best, Pres Link to comment Share on other sites More sharing options...
Pres Posted June 22, 2018 Report Share Posted June 22, 2018 Another thing that I learned long ago, and have seen it done otherwise. . . .mix you glazes wet! Saw a grad student one time gong nuts with a paint blender . . . dry, no mask. She said it was ok since it was outside! I always add enough water to just cover the mix, then use the drill mixer slowly to start, add more water, strain twice. best, Pres Link to comment Share on other sites More sharing options...
Babs Posted June 23, 2018 Report Share Posted June 23, 2018 yes, I slide the glaze ingredients into bucket already partially filled with known quantity of water.if bentonite is going in it is mixed with another ingredient prior to adding. Left to slake then sieved next day ideally. Link to comment Share on other sites More sharing options...
GEP Posted June 24, 2018 Report Share Posted June 24, 2018 One of my favorite potters, Larry Allen, does some amazing work with intense red glazes on stoneware in oxidation. According to his website, the stoneware is fired to full maturity, then the red glaze is applied in a separate step and refired to earthenware temps. https://www.la-pottery.com/main.sc Link to comment Share on other sites More sharing options...
Babs Posted June 24, 2018 Report Share Posted June 24, 2018 wow, wonder how he gets that to adhere. This wouldn't nullify the possibility of a leaching occurring if the glaze is not a stable one? His placement of colour makes this a bit irrelevant. Maybe he has a glaze thickener.... Beautiful stuff Link to comment Share on other sites More sharing options...
Rae Reich Posted July 1, 2018 Report Share Posted July 1, 2018 On 6/24/2018 at 3:56 PM, Babs said: wow, wonder how he gets that to adhere. This wouldn't nullify the possibility of a leaching occurring if the glaze is not a stable one? His placement of colour makes this a bit irrelevant. Maybe he has a glaze thickener.... Beautiful stuff Looks like a standard ^06 Christmas Red brush-on over a dark slip or engobe or underglaze, maybe pre-heated. Perfectly okay if it's not touching food or lip surfaces. And quite a pop. Link to comment Share on other sites More sharing options...
Mark C. Posted July 1, 2018 Report Share Posted July 1, 2018 I think it up to us as individuals asa to what risk level we want to work with as long as we do not allow the public to be exposed to hazards as they do not know any better. I tend to work with a few not great items (like barium and manganese )but I do so knowing the risk to myself and take precautions and the end product cannot hurt the public. I make all my own glazes so I have a responsibility along with that that I take seriously . Link to comment Share on other sites More sharing options...
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