Karen Sullivan on sun 22 jul 01
Otto's Texture...^o5
white lead 740
feldspar 240
barium carb 110
kaolin 50
cornwall stone 50
8% potassium
dichromate 95.2
(or chrome 95.0)
I got a little frightened by the fumes created
when firing in a gas kiln...so I quite using the glaze.
all of the best...
bamboo karen
on 7/22/01 2:43 PM, Ray Gonzalez at drawboy@PACBELL.NET wrote:
> Hello all..
>
> I am NOT trying to start a debate on the use of lead in a glaze. Let me
> express that the uses of this glaze will solely be on a sculptural level thus
> nonfunctional. The below listed glaze has not only Lead Bisilicate (75%!) but
> Barium as well. Lets all glaze our mugs and bowls with this one! That out of
> the way..
>
> I have been looking for one of Otto (Heinos?) glazes for a little while now.
> Well much to my surprise, while casually looking through my copy of Val
> Cushings handbook, he has it listed! Well some facsimile thereof. He
> mentions that it works almost exactly like the original. I have seen this
> glaze used and it is the most attractive glaze (if you are in to lichens and
> the like sculptural glazes.) I was unable to appropriate the glaze at the
> time and this began my search. I had a few hints. I will remark after I list
> the glaze. Here is the glaze as it appears in the handbook:
>
>
>
> ============Begin quote===========
>
> Ottos Texture revised 5/90 ^06-^04
>
> Lead Bisilicate 73.91
>
> EPK 14.17
>
> Soda Ash 3.33
>
> Barium Carbonate 8.59
>
>
>
> Add Chrome ox. 8.0
>
>
>
> Comments: This one works ALMOST exactly like the original. Gives a much
> darker red when fired to ^04 Greenish black if thin, Yellow-orange-red in
> intermediate thickness. Apply very thickly- does not run. Very textured
> glaze. Not for anything used with food! You should be able to sub Ferro 3403
> for the lead bisilicate.
>
> ==========End Quote==============
>
>
>
> okay here are my hints on this one!
>
> A professor in college mixed up a batch for a student but did not give him the
> recipe. It was extremely chrome green when wet. The student mentioned that
> it was almost all lead and EPK and "some other stuff." He also mentioned that
> it was "Ottos 'something.'" As I recall the professor used lead carbonate.
> This is the reason that I question whether or not it is the same glaze.
>
>
>
> If anyone has the original Ottos Texture I would greatly appreciate it. Also,
> I am interested not necessarily in lead bearing glazes but in lichens and
> textural low or high fire glazes if anyone has any to offer. I will be
> testing this one this week in a bisque load.
>
>
>
> Thank you,
>
> Ray Gonzalez.
>
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