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High Bridge Pottery

Member Since 19 Feb 2013
Offline Last Active Today, 01:01 PM
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Topics I've Started

Most Expensive Glaze Ingredients?

16 August 2014 - 10:02 AM

http://www.compoundc...hemistry-v3.png


Aerogel

02 August 2014 - 01:05 AM

Do you think we could start seeing kilns with aerogel insulation in the future?

 

http://en.wikipedia.org/wiki/Aerogel


White Glaze Issues.

21 July 2014 - 09:40 AM

I am having a few issues with my kiln.

 

Two bowls, same glaze. Left bowl on the middle shelf and right bowl on the bottom shelf. Only put a cone on the middle shelf as I forgot the bottom one. Got to cone 9 in the middle, I was aiming for cone 10 but firing and me have a few issues to sort out.

 

The bottom one looks under fired on half but has this really nice white speckle look on half. If I remember right, all the parts away from the elements of the kiln have this white, the half nearer the elements look under fired. The whole thing might just be under fired. I have never really understood that much what I am looking for that makes it the right kind of fired. Is my kiln much hotter in the middle than around the edge? Even the bowls on the middle shelf have this half and half look. I don't know if it is glaze or kiln related. Probably both.

 

The one from the middle is a lot more even but maybe still under fired. Got the nice speckle but a much more subtle white. There was only a small shelf after the middle which didn't cover any of the bowls.

 

Here is the glaze recipe, I have been messing around with the specific gravity so this was maybe a little thin for the glaze which is why they are not very white. I may have messed up the recipe a bit when trying to change it for the better.

 

I think I need to do a kiln full of glaze tests before glazing any more of my work.

 

Soda Feldspar = 10

Cornish Stone = 30

Quartz              = 10

Dolomite White= 10.5

Whiting             = 10.5

China Clay        = 25

Tin Oxide          = 2.7

Zinc Oxide         = 4

 

Attached File  bowlglaze.jpg   255.96KB   0 downloads


Do You Teach To Throw Off The Hump?

20 July 2014 - 10:39 AM

I had never really thrown off a big lump that much before, tried it once or twice but never sat down for a long time.

 

The past few weeks I have been really getting into it and I have found that it has greatly improved my throwing.

 

My posture is much better for not having to bend to the wheel head, I feel much more stable in myself from having to find my own balance instead of use my legs or the sides of the wheel to stable myself and I have found a calmness and softer touch that I never discovered using single balls of clay.

 

Why do most western teachers use the single ball technique as a starting place?


Why Don't Elements Glow Outside The Kiln.

17 July 2014 - 07:46 AM

Ok, so elements come out the kiln to attach to wires. Why don't they glow? This has always confused me.