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Same glaze/body. One fired flawless, the other dimpled, pinholes. Why?

The difference is a slow-cool firing. Both mugs are Plainsman M340 and have the L3954B black engobe inside and partway down on the outside. Both were dip-glazed with the GA6-B amber transparent and fired to cone 6. The one on the right was fired using the PLC6DS drop-and-hold schedule. That eliminated any blisters, but some pinholes remained. The one on the left was fired using the C6DHSC slow-cool schedule. That differs in one way: It cools at 150F/hr from 2100F to 1400F (as opposed to a free-fall). It is amazing how much this improves the brilliance and surface quality (not fully indicated by this photo, the mug on the left is much better).

Same glaze/body. One fired flawless, the other dimpled, pinholes. Why?

Related Pictures

Alberta Slip GA6-A glaze slow-cooled goes matte


GA6-A sow cooled

This is GA6-A Alberta Slip base glaze (80 Alberta Slip:20 Frit 3134) fired using the C6DHSC firing schedule (on Plainsman M390 iron red clay). If this is cooled rapidly or 1% tin oxide inhibitor is added, it fires to a glossy clear amber glass with no crystals. This base is needed to make GA6-C rutile blue, otherwise we recommend the GA6-B base (which uses frit 3195 instead), it has a lower thermal expansion and guarantees gloss regardless of cooling speed. If, on the other hand, you want to enhance this effect, just add a little more frit (to gloss it more) and more iron oxide (that should enable matting even at faster cooling speeds.

Links

Glossary Pinholing
Pinholing is a common surface defect that occurs with ceramic glazes. The problem emerges from the kiln and can occur erratically in production.
Recipes GA6-B - Alberta Slip Cone 6 transparent honey glaze
An amber-colored glaze that produces a clean, micro-bubble-free transparent glass at cone 5-6. Works well on brown and red burning stonewares.
Troubles Glaze Pinholes, Pitting
Analyze the causes of ceramic glaze pinholing and pitting so your fix is dealing with the real issues, not a symptom.
Firing Schedules Cone 6 Drop-and-Soak Firing Schedule
350F/hr to 2100F, 108/hr to 2200, hold 10 minutes, freefall to 2100, hold 30 minutes, free fall
Firing Schedules Plainsman Cone 6 Slow Cool
350F/hr to 2100F, 108/hr to 2200, hold 10 minutes, fastdrop to 2100, hold 30 minutes, 150/hr to 1400

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