Paul B on thu 6 oct 05
I am mixing a large batch of a slip glaze that i use on a lot of pots, it
is about 50% local clay from right outside my studio and i am still in the
process of adjusting this latest batch to make it match my previous one. AT
first it was crawling really bad and i have been adding cmc gum a little at
a time which seems to help, but it still has the tenedency to crawl.
It has been so long since i have dealt with crawling problems - does anyone
recall the best fix for the problem? Should i just keep adding more cmc gum
till it goes away or is there something else that works?
thanks,
Paul
Paul Herman on thu 6 oct 05
Paul,
You could try calcining (bisque firing) part of the raw clay. That
would stop it from shrinking as it dries.
Best,
Paul Herman
Great Basin Pottery
Doyle, California US
greatbasinpottery.com
On Oct 6, 2005, at 7:10 AM, Paul B wrote:
> I am mixing a large batch of a slip glaze that i use on a lot of
> pots, it
> is about 50% local clay from right outside my studio and i am still
> in the
> process of adjusting this latest batch to make it match my previous
> one. AT
> first it was crawling really bad and i have been adding cmc gum a
> little at
> a time which seems to help, but it still has the tenedency to crawl.
> It has been so long since i have dealt with crawling problems -
> does anyone
> recall the best fix for the problem? Should i just keep adding more
> cmc gum
> till it goes away or is there something else that works?
> thanks,
> Paul
>
William & Susan Schran User on thu 6 oct 05
On 10/6/05 10:10 AM, "Paul B" wrote:
> i have been adding cmc gum a little at
> a time which seems to help, but it still has the tenedency to crawl.
> It has been so long since i have dealt with crawling problems - does anyone
> recall the best fix for the problem? Should i just keep adding more cmc gum
> till it goes away or is there something else that works?
Perhaps you could calcine a percentage of the local clay to keep it from
shrinking so much. Run a series of tests, 5% calcined clay subbing for raw
clay, then an additional 5% each test.
--
William "Bill" Schran
Fredericksburg, Virginia
| |
|
