I did up several of these small Pug shapes to make a windchime ALL of them bled as shown in the photo. Neither I nor my teacher know why and he even called Coyote but all they would say is if I did not use their underglaze with their clear glaze they can't say why the colors bled. Also if you look closely at one of the images it almost looks like the clear glaze has a bunch of tiny bubbles trapped in the glaze along the bottom edge. The color of the suntan body also has a greenish cast to it which when I used it before it did not have.
Clay- Little Loafers
Underglaze Amaco LUGs - Suntan for the body color and black detail lines painted on during greenware stage then bisque fired to cone 04
Glaze - Coyote Clear - dipped then glaze fired to cone 6 on a bead rack hanging vertically
Has anyone out there used this combination and had an issue with bleeding? The underglazes were bisque fired so shouldn't they have been permanent after that stage? Did this happen because I used Amaco underglazes and coyote clear?
I'm trying to understand what I did wrong so I can adjust my process and get better results next time so any help would be greatly appreciated.
I've used Coyote's clear with Amaco Velvets, but not with fine lines so I can't attest to the bleeding issue; however, I know the bubbles (which I also get with Amaco HF9, their zinc-free clear) as well as the not-quite-clearness of it (also an issue with Amaco HF9). I'm not sure if the LUGs need it, but the Velvets require a Zinc-free clear -- and I asked Coyote if it was zinc-free, and they said it was.
On a white claybody, they are both slightly ecru. On a suntan body, with black underglaze bleeding around....well, that would explain the greenish cast. Black underglaze sometimes looks greenish when diluted.
As for the bubbles, I'm not sure how to fix that. I noticed mine where the glaze was layered thickly where a mug handle met the mug, and if yours were along the bottom edge, it's likely due to the glaze running and collecting thicker at the bottom during firing.
My only thought about how to avoid the bleeding is to underglaze, fire, then add the clear glaze and fire again.
It's too bad the underglaze ran -- those are really cute!! Good luck!