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jrm1

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  1. Thanks, Min, for all the advice and apologies for my late acknowledgement! I'll follow up on that. To date I haven't had leaks but I can't be sure I've tested enough yet.
  2. The glaze has a firing range of 1180 - 1250°C. Does that indicate a good match for the ES5 clay? If I went to 1250 I think it would run, at least that’s what I’ve been told.
  3. Thanks both. I’ll contact Scarva tomorrow and see if they can reassure me about ES5 clay and its maturity in a glaze fire at 1220 deg C. I’ve had no problems with other glazes such as Lugano Blue by Terracolor, but I haven’t done a leak test. No milkiness and great gloss. The glaze goes on way too fast in dipping for my liking though , even when pretty runny. I’m still confused why a clay rated suitable for my glaze firing would sound to you like it’s not cooked enough in the glaze firing. I’ll carry on reading the thread you pasted. Back to the underglaze by Spectrum: should I try Amaco instead and glaze with their transparent glaze? I’d rather not have to
  4. Hi Min, are you saying that the clay body needs to be fired even hotter to mature or get hard enough for tableware? The firing range of ES5 is listed as 1180-1280. Does immature mean it's not sufficiently fired?
  5. I bisque at 1000 deg C - is that cone 06? Are you saying 06 is better than 04 for being able to get the glaze to attach to the underglaze evenly?
  6. The red and yellow green shapes were painted onto the black background and they looked sharp before the glaze firing. When I dipped into the glaze, I could barely see the image underneath but I could see a kind of trace of it, like when light snow falls - you can see what lies underneath. That made me wonder at the time if the result would be flat. And it is uneven for sure. The clay was Scarva Earthstone stoneware ES5.
  7. Many thanks both for your replies. Sorry, been away. Here are some pictures.
  8. I'm new to using underglazes and am having trouble with glazing on top of the brush on Spectrum underglazes. The Terracolor Transparent stoneware glaze is patchy in thickness and milky here and there. The resulting image underneath was less defined than I had expected to see after firing. The underglazes were applied pre-bisque firing. I used disposable gloves and was very careful to keep the ware dust free and oil free. There is a small but noticeable indent or depression of the surface level on the glaze where it crosses from one colour to the next, as if there is chemical interaction between the glaze and certain colours. Three coats of underglaze were applied. I'm after a flat and even finished surface with all the detail preserved in the design. The firing schedule was 60 deg C / hr until 600, then 100 deg per hour to I think 1220.
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