Wednesday, May 16, 2012

Glazing and Firing

I thought you might like a little peak into my glazing and firing process, from start to final loading of kiln. Depending on the size of the load, this can take anywhere from a few days to two weeks. Today's firing took about 5 days to glaze (3 - 4 hours each evening).

I'm particularly excited about this load since it includes several new styles in an african/tribal theme, including Clay Dings and Spool Beads. I can't wait to see how these turn out!

Glazing...


This batch included several pieces in Black Raven stoneware. I am using a technique that involves dipping in white porcelain, then glazing in one of my favorite colors: Hot Coral.





I'm using a similar technique on these little spool beads: first I dot the rims with dabs of white porcelain, then I build up dots of Hot Coral glaze on top of them to create little "bumps".





I also have a number of these in other of my more traditional glaze treatments.





Next comes the fun part (not!): loading the kiln. 

Again, depending on the size of the load (and number of shelves), this can take anywhere from 1 to 3 or more hours. Today's load took about 2 hours, and 1 1/2 shelves.

My bottom shelf sits about 4 inches off the kiln floor - the bottom of my kiln tends to get hotter than the upper areas so I find that this little bumper space helps. As you can see, the bulk of my load is going on this shelf. I also consider this my "cone 6 sweet zone". I leave about 8 vertical inches here - the next shelf will sit on top of the square posts.

After I get everything on racks (at my workbench) I carefully move them to the kiln. Here I am doing some final straightening of gear links - I want these to hang as close to 90 degrees on the hanger bar as possible. I found this helps to prevent twisting and warping during the firing. I am also doing a final check of every single bead and component to make sure they are not touching each other (if they did, they will become permanently fused together) or the sides of racks or other kiln furniture (again, to prevent fusing). Glaze is pretty much glass - you have to think about what it might touch when it is molten - whatever it touches it will fuse to. The insides of beads and hoops are therefore bare clay (not glazed), so that when hung on wire racks they will not fuse to them.












 

The second shelf contains whatever I couldn't fit on the shelf below - mostly several black raven pieces - once fired to Cone 6, they will become a yummy deep black. :)








I top off the load with a "cap shelf" to help contain the heat within the loaded shelf zones below. Its kinda like making a sandwich with the shelves - the top and bottom shelves help to hold the heat in the zones where the glazed ware is stacked.



That's it - I started the kiln up at about 8:30 pm. Tomorrow I get to open it up and see what I got! Stay tuned!