Tag Archives: Crater Glaze

Crater Glaze

I’ve been interested in and trying to make a successful volcanic glaze for a while.  I found this fabulous crater glaze recipe in an old copy of Ceramic Review 141 May/June 1993.  It was described in a feature on James Lovera – ‘About the Individual’.

Lovera was an American Potter, best know for his bowls.  His glazes interpret nature, ‘lichen series’, ‘sky series’, ‘willow bark series’ or ‘molten lava and crater series’.  He was also fascinated by Japanese people and culture.  In the CR  article, he described the followed philosophy……

“I am trying to make a complete a statement as I can, as simply as I can.  Form, line, space, surface.  When you stop and think about it, it’s all there.  I feel that when an object is broken down into its basic elements and still leave its observer in awe, the underlying principles are at one with the universe.  The unknown is the element of the individual, the mystery”

Crater Glaze – Cone 10 (I fired to cone 9 oxidation)

China Clay     42 parts

Silica     43 parts

Potash Feldspar     159 parts

Calcium Carbonate (Lime)     78 parts

Titanium Dioxide     36 grams

Silicon Carbide     21 grams

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Errmm….Hi Al, have you got an angle grinder?

Luckily he did, since all but two pots in yesterdays firing had welded themselves to the kiln shelves.  For some reason (this is a glaze I have used before and it didn’t happen last time!) the glaze ran off the pots during the firing and when I opened the kiln this morning, they were certainly not for budging.  After a severe beating with a wooden stick, some came free willingly, others came free leaving large chunks of the foot-ring still stuck to the shelf and one poor soul is not going anywhere…he is now part of the shelf…no amount of beating or grinding is going to set him free.

By some twist of fate, the only pot in the kiln that mattered came out unstuck and unscathed. A lily bowl commission for a friend’s wedding gift, I don’t actually know the bride Janet…..but I feel like I do…..so I very much hope she likes it…when she finally get’s it.

Am pleased with the results of some of the slips, especially the Maryport slag.  This may need a second firing, but the iron in the slag has done magical things with the turquoise glaze.

The crater glaze is amazing…..love it….will be brilliant over black slip.  I have been carrying the bowl around with me all day….I can’t believe it, something that came out of the kiln like it was supposed to…in fact much better than I had thought….may even tuck it under my pillow tonight…or is that taking things a bit too far?

"Help....I'm Stuck!!"......"humm..you ain't going nowhere!"

ha ha...I'm free, but oh no...I have shelf stuck to my bottom....

That's it....get to work on my bottom with the angle grinder...gently now!

Lunar Bowl. Love this crater glaze (more on this later)

Maryport Slag pot

Lily Bowl commission for Janet's wedding pressie

Vase with Stoneycroft Ghyll Slip

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