Delores Taylor on tue 5 apr 05
I have found that mixing a large batch of a higher contentration tends to
last longer and not break down. Taking a thicker mix getting what you
need and thinning it down has worked for me in the past but I'm
questioning some assumptions and looking for experience from the group.
After reading yours and Ed's messages I wanted to know more specific
information regarding the chemistry of CMC. Does a more viscous mix
prevent bacteria growth?
After reading a link that Ed provided me on CMC I found out that some
brands are more clear than others. While a more matte surface may appeal
to some, I am looking for the clearest CMC that doesn't leave any coloring
once fired. I do not know what Seattle Pottery uses as a manufacturer
source but tomorrow I'll find that out to see if the brand I'm purchasing
could be better.
Anyone with information regarding the properties of the various kinds I'd
love to hear your experience or what you know regarding the qualities of
product within the manufacturers line.
Do things like mixing with a silver spoon effect the chemistry?
Does using ordinary well water affect the chemistry, if yes is purified
water OK or does it need to be distilled?
If you keep in a air tight container will this eliminate bacteria growth
or is it important to mix fresh each time?
I am a pate de verre artist and have used differnt types of cellulose
produtcts which might work in one application but produce unwanted results
when mixing with frit. My goal is to get clear results and not have
chemical reactions or select a product that produces a slight tint to the
frit. At what temperature does the CMC break down and go away? Once the
CMC breaks down completely does this make the glaze run and start
bleeding, or some other effect? Or is only meant as a cold suspension so
the glaze is homagenous and is evenly distributed onto clay or used so you
can spray and get an even coat of glaze and consistent results?
Thanks to all for a reply and sorry to any who feel this is old ground as
I'm new to this list.
Delores Taylor
Woodinville, WA
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