John Baisch on tue 3 mar 98
Hello all,
Playing with Glazes and wanted to experiment with Randy's
Green a little. I've been firing
Randy's Green from Ruthann's soda firing book in cone 10
salt reduction. I'd like to try firing a version of Randy's
green in both Cone 5-6 oxidation no-salt and also in ^5-6
reduction. Has anyone had any experience with this and/or
has a variation of the recipe that will work?
Any help would be grealty appreciated,
Thanks much,
John Baisch
LESAINT1 on wed 4 mar 98
Hi John. I got this copy of Randy"s Green at a workshop, where it was
described as a C 10 glaze. It works very well as is at C 5-6 and is a deep
forest green, slightly translucent. Occasionally I have underfired it to C4,
where it becomes matte and slightly metallic and looks very nice.
Randy"s Green 7336 gram batch
F/4 feldspar 1400
Potash feldspar 1670
Ball clay OM 4 800
Silica 1280
Strontium carb 1000
Whiting 700
Dolomite 486
Tin oxide 293.44 (4%)
Copper Carb 440.16 (6%)
I hope this helps.
Leslie
Ron Roy on sat 7 mar 98
This looks like a durable glaze at cone 6 but not at cone ten.
This is a lot of copper for a functional glaze to have in it. I guess what
I am saying here is - it would be better if the copper were lowered to 2%
if it's for food bearing surfaces. Copper has the reputation of make glazes
more soluble - why not give it the 24 hour vinegar test just to make sure
it will not change colour with use.
>----------------------------Original message----------------------------
>Hi John. I got this copy of Randy"s Green at a workshop, where it was
>described as a C 10 glaze. It works very well as is at C 5-6 and is a deep
>forest green, slightly translucent. Occasionally I have underfired it to C4,
>where it becomes matte and slightly metallic and looks very nice.
>Randy"s Green 7336 gram batch
>F/4 feldspar 1400
>Potash feldspar 1670
>Ball clay OM 4 800
>Silica 1280
>Strontium carb 1000
>Whiting 700
>Dolomite 486
>Tin oxide 293.44 (4%)
>Copper Carb 440.16 (6%)
>I hope this helps.
>Leslie
Ron Roy
93 Pegasus trail
Scarborough Otario
Canada M1G 3N8
Phone: 416-439-2621
Fax: 416-438-7849
Web page: Home page http://digitalfire.com/education/people/ronroy.htm
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