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Member Since 28 Jun 2010
Offline Last Active Today, 05:58 AM

Posts I've Made

In Topic: Two Glaze Firings, Cone 6 Then Cone 06

25 October 2016 - 06:49 PM

Is the clear the same batch as used before or a new batch? It could be something changed in the ingredients used to mix the clear. Is the black underglaze the same?

In Topic: Cone 6 Clay Glaze Fired To Cone 06?

25 October 2016 - 06:44 PM

A cone 5/6 clay body glaze fired to cone 06 will leak like a sieve as the clay body will be under-fired and not vitrified.  If the piece is non-functional, then that is less of a concern; but if the piece is functional and intended to hold liquids, you are asking for trouble.  You may also have glaze fit issues. 


Find a cone 5/6 glaze instead.

In Topic: Water Seeping Through

19 October 2016 - 06:48 PM

I'd find a new clay manufacturer and clay body. A properly vitrified clay fired to maturity should be water tight without glaze. Only an underfired/non-vitrified clay body weeps. Sounds to me as if they do not know their product or are unwilling to admit their product is faulty. Find a cone 6 clay body with less than 2% absorbency. Then you will not have to rely on glaze to make the vase water tight. A clay manufacturer stating that glaze is needed to seal the clay body is just plain out to lunch.

I make and sell ikebana vases; my cone 6 vases are made using cone 6 clays (Little Loafers and Red Rock from Highwater; occasionally 266 from Standard) and fired to cone 6 with a 10 minute hold. I chose those because they have low absorbency at Cone 6. My cone 10 vases are made using cone 10 clays (Laguna's Dark Brown, Standard's Troy wood fire stoneware or porcelain, or Highwater's Phoenix) -- clay bodies with absorbency of 1% or less at cone 10. I use a liner glaze -- sometimes clear, sometimes another color glaze. Most of mine are only glazed on the inside. I also randomly pull vases and test them with water. I've had vases sit on my table with water/flowers for two or more weeks with no weeping.

In Topic: Glaze For Satin/matte Dinnerware Safe Porcelain Black Clay

18 October 2016 - 08:24 PM

Possibly black stain was wedged into clay body and fired with no glaze.

John Britt has a satin black (John's 10x)in his Cone 6 Glaze book that uses 10 different ingredients, each 10%, plus 5% black mason stain 6600. I use it as a liner glaze for vases.

On the black mason stain, be aware some use cobalt that can give a blue tint to the black; others do not use cobalt.

In Topic: Refresher For How To Change Your Avatar

18 October 2016 - 07:15 PM

Marcia . . . I had to click upload after doing the options menu, select make photo.