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jpdes

Member Since 29 Oct 2012
Offline Last Active Yesterday, 07:31 PM
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Posts I've Made

In Topic: Curious Question About Heat Rate Near Cone 6 - Slower Rate - Glaze Improvement?

17 May 2016 - 10:58 AM

There's an amazing amount of information in this thread.  Thanks so much.

 

Further to the rate of firing/slow cooling concept, I have been surprised at the amount of glaze alteration that can occur on refiring Cone 6 glaze fired ware to lower temperatures.  For example to mature china paint or attach decals.  I have seen noticeable permanent visual change in glazes when refired to as low as 1450F which must be below glaze softening temperature.  This has been most noticeable in titania containing glazes.  (Thank you Joseph for alerting me to that.)

 

To guide exploration of glaze manipulation at such very low temperatures I'm interested in further information and concepts regarding

 

Lowest temperatures at which permanent glaze appearance alterations can occur?

 

Glaze ingredients and combinations which may react at these lower temperatures? 


In Topic: Curious Question About Heat Rate Near Cone 6 - Slower Rate - Glaze Improvement?

14 May 2016 - 10:23 PM

The modifier glaze effects are dramatic.  Are you willing to share more about its composition?


In Topic: Us Pigment Stains And Raku Glazes

05 June 2015 - 09:49 PM

Thanks for the replies.  US Pigment's reputation clearly supports trying their proprietary products.  The images I've seen of Marcia Jestaedt's work are impressive and the description of the process on her website is very interesting.  I've successfully used low fire glazes for raku but the silver nitrate wash takes it to a new level - at least when applied by expert hands.


In Topic: Large Flat Pieces Cracking During Glaze Firing

25 May 2015 - 07:55 PM

How close together/dense should the coils be so that the bottom is sufficiently supported and does not distort on the glaze firing (for a mid fire stoneware clay)?  Should the coils be kiln-washed to prevent sticking?