Potters & Sculptors - Making Rock from Mud
The mug displayed is an example, though it is not my own.
Do we achieve this with a "thinner" glaze or one that is transparent ? Usually we do not want the clay to show through a glaze, but for some effects, such as stamps etc, this is a desired effect.
Thought i would try a Mastering Cone 6 base, and color it for tinting.
appreciate any help., cp
I just noticed this post and am surprised there aren't lots of answers here! Perhaps you've already tested some glazes and discovered what works for you but if you haven't I'd suggest glazes that move some so that there will be a flow over the design allowing some "break" to show. If you were referring to Mastering Cone 6, glossy base 1, I'm sure you'll find it works well. It is one of my staple glazes especially for functional ware, and it breaks nicely.
Here's a sample of 12 glazes which have an interesting break in the Insight Live Glaze Database.
Many glazes with rutile will break because it's opaque when thick and translucent when thin.
Other glazes slow cool differently where thick or thin. We're currently using a 60 degree F slow-cool between 1,800F and 1,500 F.
Tests tiles are helpful because many glazes depend upon the thickness of the glaze application, with no break when the glaze is applied too thick or too thin.
Blue Matte Jayne Schatz
Clear Base Blue plus 10% 3269 Frit
Costello Carbonate Jayne Schatz
Frogskin is a uniform brown when applied too thin
Gartside Gloss (Peacock variation) shows the thick vs thin rutile
Lynn's Glossy Grey Green - uses titanium dioxide rather than rutile (titanium dioxide ore)
Magruder Red with 10% 3134 Frit
Magruder Red with 10% 5301 Frit
White Bird - also a rutile dependent break