I fire soda-lime glass into some of my work, only on pots that arent gonna be used for food/drink, or in places where it wont come into contact with food, like the lid of a butter keeper, etc. Neil is right functional ware, which has an extremely poor fit (the tighter the craze lines, the worse the fit) will flake off small pieces of glaze during use. Try using glazes that have different surfaces (matte vs gloss), as well as contrasting colors. It's all about testing to see how different glazes react with each other. You can easily create a similar affect at any temperature by layering glazes and letting them flow together. It looks to me like the just used the milk white glaze on the entire piece, and added a glossy crackle glaze on top of it, or vice versa. As cool as that looks, I think it's a really bad choice for plates. You can often feel the cracks in the glaze with your fingers when it's that crazed, which to me means little bits could flake off, especially with using utensils on it. I don't like glazes that are that thick and heavily crackled because I'm afraid of little flakes of glaze coming off. Link to the article here with the test procedures explained in-depth. There is also the separate issue of crazing weakening the it would take testing but I think you could get that look by using a transparent toffee coloured crackle glaze for the darker part and then a fluid off-white glaze overtop. I did note that the glazes were on porcelain, it would be interesting to see the tests done on porous clay. With the non crazed glaze that contained off gassing bubbles (and microscopic broken open bubbles on the surface of the glaze) bacteria colonies were present after just wiping and drying but no bacteria after rinsing with water or soap and water or dishwasher.īottom line was the dishwasher killed all bacteria on the crazed glaze surfaces. Samples from cleaning in a dishwasher had zero cultures of bacteria. Samples that were cleaned with soap and water (and dried with paper towels) still contained bacteria. Samples that were rinsed with water and dried with paper towels still contained bacteria but not as heavily laden. All studies were repeated in triplicate with same results.Ĭulture plates from bacteria laden crazed glazes that were just wiped and dried were still bacteria laden. Heavily crazed glaze and a glaze with bubbles from off gassing were tested in a laboratory setting with a bacteria found in milk. A study of this long believed theory was done by Ryan Coppage, PhD, Ruhan Farsin and Laura Runyen-Janecky, PhD. There was a recent study about the possible link between crazed glazes and bacteria. This will eventually make the person using it ill. I wouldn't use this on functional work, the crackle will allow bacteria to build in the cracks.
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