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Showing results for tags 'blistering'.
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I have made my own black stains with the same bodies of porcelain I’m using ( Audrey Blackman & Parien )They fire up to 1240 degs ( one fire ) My problem is the stained surface ALL have blisters Any suggestions on how I can resolve this issue ? Is there mayb something else I should be adding aside from porcelain body stain and water ( which I then pass through a mesh sieve) Commercial stains seem fine Would appreciate input Kind regards Nicky
I am new to glazing. I purchased a bucket of clear glaze. It was advertised as cone 6. I fired a few pieces (I know - should have done a test fire) and got blistering all over the pieces - some popped. In looking closer at the fine print, it is a cone 06 glaze. Can I retire and save these pieces? Or any help anyone can give. I know I should be chastised. Be easy on me. Thanks!
I've been using this glaze for many years but have recently been encoutering some pretty bad blistering and some minor pinholing and I"m a bit mystified as to it's cure. The glaze: 53 Frit 3110 25 Spodumine 2.8 Strontium Carbonate 3 Silica 13 Gerstley Borate .6 Whiting .1 Magnesium Carbonate 2.5 Zinc Oxide 5 Rutile .5 Cobalt Carbonate 1.5 Black Copper oxide. At first I thought maybe it was getting old and since it contains soluable ingredients should be remade but it still blistered. It is a cone 6 glaze so I took it to cone 7. Blistered. Held it for a half hour at cone 6. Blistered. Changed out the Whiting and rejuggled the other ingredients. Still blistered. Thought that maybe something wierd was going on with the Zinc (it hardened) and replaced that with fresh. Still Blistered. On a recommendation from the local ceramics supplier I re-did the elements in the kiln (still blistered though they needed changing anyhow). Out of all the glazes I use, this is the only one giving troubles and it never used to be a problem. Firing it to cone 6 a second time cures the blistering. My next step it to change out the clay body and after that purchase all new glaze ingredients from a supplier on the other side of the country. Does anyone have any advice on this? Thanks much in advance. ps. Everything is bisqued to cone 04 before glazing and no changes have been made to the process except a new batch of clay body was purchased.