Nancy Braches on thu 28 sep 06
I used to work at studio that used what they called floating blue green (which I figure is floating blue but they didn't want anyone to know their glazes) When I put honey over this it's gorgeous but runny, just like it was in that same studio. I have sieved this glaze 4 times but find a still have a few tiny lumps of one of the chemicals that just won't break down, I just looked at my latest test bowl again (that came out of my kiln firing @ cone 6 but the bottom shelf fired at about 5 1/2 and that floating blue...was blue. But the bowl has a few hard white chunks about the size of a pencil tip that was in the glaze. I rub all my pieces after the glaze dries to smooth them and even up the glaze if it's not even and thought I had gotten the FB smooth but low and behold there are those little chunks. I'm thinking of sieving this glaze through cheesecloth to get rid of the chemical that isn't breaking down...does anyone have any input on this that might help me fix this
problem. I have a couple of glazes that like cone 5 firing so I'll start putting myFB in with those loads since it seems to do better but I have to get the chunkies out!
Nancy
Hilltop Pottery
Nancy Braches wrote: Hi everyone
I made a test batch of floating blue and it did exactly what it was supposed to...break green on the rims and a nice blue.
Then I went and made a slightly larger batch (only 10 lbs). I have fired it 3 times and my floating blue is more a floating green and not a pretty green at that. Of course the places I threw honey (or as I call it, Runny Hunny) on the bowl I get the most gorgeous blue but the underlying floating green is uck!
Can anyone who knows the floating blue tell me why I'm getting green instead of blue. I used the recipe in the archives which matches the recipe in the clay times floating blue article from a while ago.
Thanks in advance. I can post a picture of bowl in myyahoo picture if anyone is interested in seeing it.
BTW....thanks to all who helped with my blue glaze..what's missing? I added 1 tsp of cobalt carbonate to my 1lb sample and have a nice medium blue that covers well.
Nancy
Hilltop Pottery
---------------------------------
Do you Yahoo!?
Get on board. You're invited to try the new Yahoo! Mail.
______________________________________________________________________________
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
---------------------------------
Do you Yahoo!?
Everyone is raving about the all-new Yahoo! Mail.
Bonnie Staffel on fri 29 sep 06
Nancy, I had some zinc that was very old and probably absorbed some moisture
in storage. I had to grind the chunks in a blender and then sieve them
through an 80 mesh sieve. If these spots in your glaze can be felt, that
might be the problem. Rub some of your zinc between your fingers to see if
you feel any small chunks. I had to ditch that material as it was too hard
to grind.
Otherwise, I have gotten white spots on my Mason Stain decorated pots
because I put the pot in too soon after glazing. My take on this is that
the moisture boiled through the layers of glaze on top of the opaque white.
In this case no texture could be felt, just seen.
Hope this might work.
Bonnie Staffel
http://webpages.charter.net/bstaffel/
http://vasefinder.com/bstaffelgallery1.html
DVD Throwing with Coils and Slabs
DVD Beginning Processes
Charter Member Potters Council
| |
|
