William & Susan Schran User on sun 29 apr 12
On 4/28/12 7:42 PM, "Url Krueger" wrote:
>CMC is a high molecular weight organic molecule
>that swells up in water like a tiny sponge. Put
>enough CMC in your glaze and it will turn into
>a jelly-like consistency that should hold anything
>in suspension.
>
>Of course being organic it is also prone to rot so
>I wouldn't mix up a 5 gallon batch.
I use a CMC solution to wet my crystalline glazes for both suspension and
adhesion to the pot. Crystalline glazes contain little or no clay
components so must have an addition to suspend, but also without the clay
and a large percentage of zinc the thick application of glaze with crack
and peel on drying.
I make the solution a couple days ahead of mixing the glazes. I add 25
grams CMC to one quart of hot water. I don't mix it, just let it sit and
soak up water for a couple days. It will then look like a gelatin iceberg
floating in the water, but a good shake or stir will blend it. I wet my
dry glaze materials with this solution and can apply the glaze by brush at
any desired thickness with no issues. This may work well for the thick
application needed for the copper red glaze.
Bill
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
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