Haley

My mistake. I hit send too early. - Factory cone fire mode “slow” setting actually is. They both seem like next steps for me. I’ll reach out for feedback after my samples (from another batch of clay) come out of a glaze fire and I hear back from standard.

Callie - I have reached out to standard and I’ll try to figure out what the dact

Thanks for all the responses! Matalyn T - I’m not familiar with absorbency testing. I’ll look it up. GEP - I can toy with thickness. It just hasn’t been a problem till recently so it feels to me like there is something else going on, even thin applications are pinholing on me right now. I’m using witness cones and hitting my temps so I know I’m hitting cone 6 for glaze. I could up my bisque since my kiln is really only going to 05 when I set it to 04. Hulk - I’ve been wondering if the foreign material in the clay is giving me off gassing trouble. The pinholes go down to the clay and some of them go down into the clay. I can put a needle tool down into the clay. Like something burned out. I took a pic of some of the plastic, rubber and wood that I’ve been picking out of the clay. These crock’s are thicker because they are larger forms so there might be more junk in the wall. Kelly - many of them are deep. Even the tiny ones you can’t see the clay in the bottom because they go so deep. They are just black holes. Here is a pic of some of the debris I’ve been picking out of the clay. I’ve lost a lot of it but started collecting it recently. I found a piece of crumbly black rubber about the size of my fingernail that I lost. That 1/2 inch long piece is wood.

Some of the glaze raw materials are new. I also received a new batch of clay so it could be that but I haven’t reached out to Standard yet. I remixed my glaze to rule out a glaze mixing error. I understand zircopax stiffens glaze melt so I tried mixing samples with less zircopax but the white isn’t bright enough. I’ll try to add a picture so you can see the pinholes. another challenge is that my test tiles come out just fine when I use base 1 or base 2 with various amounts of zircopax but once I commit to trying one of the glazes I get pinholes on taller forms like a travel cup or kitchen crock.

Hello potters! I have had a rise in pinholes on a clay (Standard 553 Buff) and glaze that I’ve had relative success with for years. I’m hoping someone has dealt with something like this before. I use high Calcium semimatte Base 1 from Mastering Cone 6 Glazes with 8-10% zircopax. Here is the recipe: 20 3195 29 Wollastonite 4 Neph Sye. 30 EPK 17 Silica 8-10% Zircopax I have always had minor pinholing but recently have had too much to sell the work and feel good about it. I’ve tried semimatte base 2 from the book also and still get the same amount of pinholing. I bisque to ^05-04ish and I do a drop and soak from: 2185 hold for 10min rate 400 to 2085 hold for 30min Slow cool from 1900-1400 rate 80 I hope that is enough info to get started. Let me know if anything is unclear. I’d be willing to use a different glaze if it comes highly recommended but would love to tweak what I’m already using if possible. Thanks in advance! Haley