Colleen Riley on wed 18 oct 06
Hi Dustin
Here is the matt long recipe (methinks the same as Pinnell porcelain):
Grolleg 55
Custer 15
Silica (200m) 27
Calcined Alumina or
tubular alumina 3
Veegum T 2
We recently went in on a pre-mixed batch with Joe Christenson, and I do know
he has been getting good flashing. It's a nice throwing body. Holds up
pretty well and attaching stuff isn't too persnickety.
BUT...we don't get good flashing on that body in our soda kiln, and we think
it's because Joe reduces the heck out of his kiln. Our firing seems more
like what you do: neutral atmosphere, with a little body reduction and then
again at soda time. I have better luck with the Continental Clay and
Minnesota clay grolleg porcelain bodies, whatever they are. It is believed
that Custer works better than G200 for flashing, so any body with that and
EPK/Helmar/Goldart/xx etc is worth a try.
You can spray your pots with epk terra sig. Fun fun fun(!@$#@&!) but it's
pretty much a guarantee to get flashing. (I've also tried om4 and hawthorn
sig and like epk best). You can spray on both bone dry and bisque...bone dry
is easier and more forgiving.
A question: I'm looking for a porcelain body that doesn't get 'short' at
leatherhard stage. I do a lot of carving on my pots and seem to have trouble
with the clay chunking off at that stage unless I use razor-sharp tools.
Maybe this is just the nature of porcelain?... but it seems that there's a
very short window of opportunity to work between too-soft leatherhard and
dry. Do you know if those other 2 recipies hold up better that way? Anyone
else know of a magic ingredient or recipe that might help?
.......
Subject: matt long's porcelain claybody? /flashing question?
i was wondering if anyone has the recipe for matt long's claybody? i have
a Joe Christensen cup made from matt long's porcelain and it seems to
flash very well. any info on the recipe would be greatly appreciated.
here are two recipes i have used in the past with good success. from val
cushings book.
Dustin Harris on thu 19 oct 06
hi colleen,
thanks for the info. as far as a magic ingrediant goes for a carving
porcelain i can't help you. someone that might know is in your area.
becky Lloyd
http://www.lloydpottery.com/
she does an insane amount of carving.
also you might try using a resist like shellac on bone dry porc. and using
a damp sponge to carve away the areas where the resist is not.
hope this helps and thanks again
dustin
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