Does anyone have thoughts on why egg over dehaka purple would crawl like this? Both were poured in and immediately out.
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Hi Carolyn! I just responded to another post regarding flakiness/crawling which I'll copy here. Of the glazes in our lineup currently, I believe that Dehaka Purple is probably the most likely to flake of them all. The light blue/purple color comes from magnesium carb interacting with cobalt, but the magnesium carb is a huge contributor to flaking. It the primary material in Lalone's Crawl that we use to force the crawling effect. I might try using a single dip of Dehaka Purple if you're going for that color. You might be able to get away layering it with small, thin pieces that you can dunk quickly with tongs. Good luck!
Ned
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In general, a thinner application is less likely to flake. If a glaze is prone to flaking, it usually coincides with gathering thickly on the pot during application. You also want your glaze layer to dry quickly after application. For flakey-prone glazes, often the first layer appears to dry instantly. Underneath that glaze layer though, the clay is still saturated with water. This means the second layer will sit on the pot for a long time without drying and this almost always leads to flaking. So don't be tricked into applying the second layer of glaze too soon! Waiting 30-45 mins instead of the typical 10-15 can help.
Flakey-prone glazes usually don't require two full dips. I like to do 1.5 layers, which means I dip the pot in the glaze quickly, lift it out, wait about 10 seconds and then quickly dip it again. I've been doing this for years with Mar Sara and consistently get the tomato red I'm looking for.
If a glaze is prone to flaking, you should really only consider layering it with a second glaze that is known not to flake. Flakiness comes from certain glaze materials that swell with water (the main one being clay). The studio glazes that are known to sometimes flake are:
Satin White
Mar Sara (less so)
Dehaka Purple
Neo Steel
Thermal Yellow
Assad Black (less so)
I'm also a believer now that flaking is a semi-seasonal issue that worsens in the summer. It must be connected to the humidity. Just this year we started making minor adjustments in our glaze bentonite additions to counteract it.