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Feb 14-15, 2026 - Major Server Upgrade Done

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From Scribbles to Success: Fixing This Glaze Recipe

If you do DIY pottery glazing you may have recipes scribbled onto cards like this. But the card is not the big issue here; it is that recipe! It really needs some work. Here is what could be done.
-Add this as a recipe in an account at insight-live.com (and assign it a code number to write on all test specimens) to start a testing project. Along the way document it with pictures, firing schedules, general notes, etc.
-With all that feldspar, it is sure to craze, reducing the high thermal expansion K₂O it contributes in favor of low expansion MgO (from talc) is the first fix to try.
-With all that clay (29 total) it is likely to crack while drying (and then crawl during firing). Try reducing shrinkage with 29 kaolin (no ball clay). If it still cracks, substitute some for calcined kaolin.
-And those colorants: It is better to use cobalt oxide than carbonate. A burnt umber increase could be tested to eliminate the need for both the manganese and iron (since it supplies both and has zero LOI). Better yet, remove all four and use a black stain (7% would likely be enough).
-Perhaps the best option is to get a different glaze recipe. This is a calcium matte to G1214Z1 would be a good start. For a more pleasant surface, G2934.

Related Pictures

Tuning the degree of gloss on a matte black glaze

This picture has its own page with more detail, click here to see it.

These 10-gram balls were fired and melted down onto a tile. The one on the left is the original G2934 Plainsman Cone 6 magnesia matte with 6% Mason 6600 black stain. On the right, the adjustment has a 20% glossy G2926B glaze addition to make it a little less matte. Notice the increased flow (the ball has flattened more) with the addition of the glossy. In addition, while the percentage of stain in the one on the right is actually less (because of the dilution of the transparent), the color appears darker! Tuning the degree of matteness when making color additions is not just for appearance, for functional ware it is also about achieving a surface that does not cutlery mark and is not leaching heavy metals.

Are your glaze recipes lost in binders or buried on your phone?

A messy binder that someone uses to store their glaze recipes

This picture has its own page with more detail, click here to see it.

Consider how valuable your glaze and body development records are. Are they in a three-ring binder? Or do you have pictures and notes scattered across apps on your phone? If you're testing, adjusting, or developing glazes, bodies, underglazes or engobes, traditional notebooks and binders are holding you back. They don't have keywords, and they are only grouped, not categorized. With Insight-live, you can link recipes to each other and to important details like photos, materials, firing schedules and URLs. Organize test recipes into projects, classify them with typecodes (tokens), calculate chemistry, and create mix tickets. Research materials and perform keyword searches. Put anything side-by-side to study and determine the next move. Physical notebooks can’t do this—but your account at Insight-live.com can!

Two cone 6 black glaze recipes I control and adjust

A gloss and a matte based on two reliable base recipes

This picture has its own page with more detail, click here to see it.

The clay is Plainsman M370. Fired at cone 6 using the PLC6DS drop-and-hold firing schedule. The inside glossy glaze is G2926BL. The outside glaze base is G2934BL matte. Both recipes contain 6% Mason 6600 black stain. G2934 is tricky to keep consistent because the matte surface is a product of both the chemistry and the firing schedule. Thus, we faced lots of testing when it became necessary to substitute Ferro Frit 3124 for the supposed equivalent, Fusion Frit F-19. Early results showed a little better melting, so the 10-15% glossy we normally add to move the stony matte toward satin is not needed. However, we still made an 85:15 batch for our more frequent slow-cool C6DHSC firings (otherwise this G2934 mug would have fired too matte). So with the two recipes and two schedules, I can produce four surfaces, from gloss satin to stony matte. Digitalfire was the first online source of a matte black functional glaze with tunable matteness.

Videos

Links

Materials	Calcined Kaolin This is kaolin powder that has been fired in a furnace to remove the 12% crystal water and render it non-plastic.
Typecodes	Glaze Chemistry Case studies where glaze chemistry was used to solve a problem.
Glossary	Digitalfire Insight A downloadable program for Windows, Mac, Linux for doing classic ceramic glaze chemistry. It has been used around the world since the early 1980s.

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