Joe H Posted November 28, 2023 Report Share Posted November 28, 2023 At the risk of sounding incredibly dumb. I don't understand the difference between Underglaze and Glaze. Is there a simple answer? Quote Link to comment Share on other sites More sharing options...
PeterH Posted November 28, 2023 Report Share Posted November 28, 2023 Two answers in one. Digitalfire https://digitalfire.com/ is a mine of pottery information, for example Underglaze https://digitalfire.com/glossary/underglaze Hulk 1 Quote Link to comment Share on other sites More sharing options...
Joe H Posted November 28, 2023 Author Report Share Posted November 28, 2023 Wow, this is exactly what I was trying to find. Thank you so much for the reply and the help Hulk, PeterH and Rae Reich 3 Quote Link to comment Share on other sites More sharing options...
neilestrick Posted November 28, 2023 Report Share Posted November 28, 2023 I describe underglazes as being somewhere between a slip and a glaze. They melt/fuse more than a slip, but don't don't totally melt into glass like a glaze. Also, commercial underglazes can be applied at any stage of the process- wet, leather hard, bone dry, or bisque. When to apply them depends on how you're using them and the brand you're using. Hulk, Rae Reich and PeterH 3 Quote Link to comment Share on other sites More sharing options...
Chilly Posted November 30, 2023 Report Share Posted November 30, 2023 Further to the technical explanation in the link, I put it like this to my group. Underglazes (usually) don't move or mix during firing. They sit/stand still. When clear overglaze is applied to fired underglaze it (usually) doesn't cause the underglazes to move or mix. And (usually) the colour is WYSIWYG. So, underglazes are good for painterly pictures, drawing, writing. Glazes can/will move or mix during firing, particularly on vertical surfaces. And (usually) they are not WYSIWYG. So, if you want defined colour areas, use underglaze, if you don't mind if they mingle use glazes. Apart from all the other options, like matt, textured, crystals......... Magnolia Mud Research, PeterH and Rae Reich 3 Quote Link to comment Share on other sites More sharing options...
neilestrick Posted November 30, 2023 Report Share Posted November 30, 2023 51 minutes ago, Chilly said: When clear overglaze is applied to fired underglaze it (usually) doesn't cause the underglazes to move or mix. @Joe HUsually is the key word here. Most of the time they don't, but if your clear glaze is fluid enough it can cause them to bleed a bit, which is actually a really nice effect in some cases. Black seems to be the most likely to bleed, but blues can do it as well. I personally haven't really seen it happen in other colors, but there are a lot of variables at play. Chilly 1 Quote Link to comment Share on other sites More sharing options...
Rae Reich Posted November 30, 2023 Report Share Posted November 30, 2023 @Chilly - Perfectly said! Copying for the front page of my Glaze Book! Chilly 1 Quote Link to comment Share on other sites More sharing options...
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