Barney Adams on tue 27 apr 99
Hi,
I finally got the crawling and pinholes licked. Not sure which effort
cured what but after 2 bad glaze firings it's nice to open the kiln to
some of the good stuff. I fired a little lower probably ^51/2 the 6 was
just starting to bend and the 5 had gone over half way. I also
programmed
the controller to drop to 1900 then climb back to 2050. I was a little
worried
about over firing and next time I may try it back up a tad higher. The
blackberry
stain never really came out I ended up mixing all the batches of it
togeather
and adding some bentonite. It did'nt crawl but I was just disposing of
it. I also
finally used some stain in some body for the marbelized effect. I'm very
happy
with that result. (it's what I originally got the stain for). Here's my
base that
worked for me in case.
stain base 1A
============
NEPHELINE SYENITE... 25.00 25.00%
GERSTLEY BORATE..... 18.00 18.00%
SPODUMENE........... 6.00 6.00%
WHITING............. 10.00 10.00%
BONE ASH............ 2.00 2.00%
FLINT............... 32.00 32.00%
STRONTIUM CARBONATE. 3.00 3.00%
EPK KAOLIN.......... 4.00 4.00%
========
100.00
CaO 0.60* 11.38%
MnO2 0.00 0.00%
Li2O 0.05* 0.49%
MgO 0.06* 0.81%
K2O 0.04* 1.38%
Na2O 0.18* 3.78%
Fe2O3 0.00 0.16%
TIO2 0.00 0.01%
B2O3 0.25 5.81%
AL2O3 0.30 10.42%
SiO2 3.07 62.36%
P2O5 0.02 0.99%
SrO 0.07* 2.40%
COST/KG 1.68
Si:Al 10.17
SiB:Al 11.06
EXPAN453.62
I added 5% of mason stain #6378 zirconium vanadium blue. The color is
nice
and I got a good melt. I could have probably put it on a little thicker,
but I was
a scared. Thanks for all the help.
Barney
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