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Two transparent glazes on the same dark burning clay. Why different?

These two glazes are both brilliant glass-like super-transparents. But on this high-iron stoneware only one is working. Why? G3806C (on the outside of the piece on the left) melts more, it is fluid and much more runny. This melt fluidity gives it the capacity to pass the micro-bubbles generated by the body during firing. G2926B (right) works great on porcelain but it cannot clear the clouds of micro-bubbles coming out of this body. Even the glassy smooth surface has been affected. The moral: Two base transparents are needed, each being able to host colors, opacifiers and variegators. But there is a caveat: Although reactive glazes leverage melt fluidity to develop interesting surfaces they are more tricky to use and do not fire as durable.

Two transparent glazes on the same dark burning clay. Why different?

Related Pictures

An ultra-clear brilliantly-glossy cone 6 clear base glaze? Yes!

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I am comparing 6 well known cone 6 fluid melt base glazes and have found some surprising things. The top row are 10 gram GBMF test balls of each melted down onto a tile to demonstrate melt fluidity and bubble populations. Second, third, fourth rows show them on porcelain, buff, brown stonewares. The first column is a typical cone 6 boron-fluxed clear. The others add strontium, lithium and zinc or super-size the boron. They have more glassy smooth surfaces, less bubbles and would should give brilliant colors and reactive visual effects. The cost? They settle, crack, dust, gel, run during firing, craze or risk leaching. Out of this work came the G3806E and G3806F.

Bubble clouding in clear glazes on dark burning stonewares

Tap picture for full size and resolution
Clear glaze bubbliing on dark stoneware

The center mug is clear-glazed, at cone 6, with G2926B (notice it is saturated with bubble clouds). This dark body, M390, is exposed inside and out (the other two mugs have the L3954B white engobe inside and midway down the outside). G2926B is an early-melter (starting at cone 03) so it is bubble-susceptible to dark-burning bodies that generate more gases of decomposition. It appears to perform well on the inside engobed surface of the mug on the left but actually, the bubbles are just less visible against the white background. The honey colored glaze on the outside mugs is GA6-B, it fires with very few bubbles and is a good choice for use on dark clay bodies.

Links

Recipes G3806C - Cone 6 Clear Fluid-Melt transparent glaze
A base fluid-melt glaze recipe developed by Tony Hansen. With colorant additions it forms reactive melts that variegate and run. It is more resistant to crazing than others.
Recipes G2926B - Cone 6 Whiteware/Porcelain transparent glaze
A base transparent glaze recipe created by Tony Hansen for Plainsman Clays, it fires high gloss and ultra clear with low melt mobility.
Glossary Transparent Glazes
Every glossy ceramic glaze is actually a base transparent with added opacifiers and colorants. So understand how to make a good transparent, then build other glazes on it.
Glossary Melt Fluidity
Ceramic glazes melt and flow according to their chemistry, particle size and mineralogy. Observing and measuring the nature and amount of flow is important in understanding them.
Troubles Clouding in Ceramic Glazes
There a many factors to deal with in your ceramic process to achieve transparent glazes that actually fire to a crystal-clear glass

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