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David F.

Tin And Zercopax

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I see the Falls Creek Shino recipe used in a recent CAD article uses both zercopax 9.4% and tin oxide 4.7%.

I thought these are both opacifiers ...do I need both?

I would like to mix up a test batch; but don't have tin ox in hand. How do you think it will turn out if I skip the tin ox? 

 

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I know nothing about this glaze or its firing temp but will say Zircopax and Tin do get used together.

If it calls for both use both.

I assume you are concerned about the cost of tin.Tin is like many materials it goes up in price and down depending on many factors -right now its up.

Mark

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Tin has some unique properties you can't get with zircopax.  It has a tendency recrystallize in firings in a way that increases both opacity and whiteness.  This is especially true of the old leaded tin glazes.  This property makes it a much more effective opacifier and whitener than zircopax alone. 

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One of  my red glazes uses tin.Tin as noted has unique qualities.

In one of my glaze calc classes back in school I reformulated (before glaze softwarewas on the planet) a earthy brown glaze for cone 10 reduction called Wamo mamo which had a large amout of tin in it. I found you could subsitute about 1/2 for Zircopax before losing the tin qualities which we liked-I to this day still have that glaze called mamo II laying around.

I heard this glaze was from Alfreds but never confirmed that.

Mark

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 I'm not that concerned about the cost of the tin, all though cheeper is good. I really wanted to simplify the number of ingredients I have to stock. I have about 10 glazes that I think are ok, but i'm not thrilled with any of them.

 

Here's the recipe....and a link to the before mentioned article  https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB0QFjAA&url=http%3A%2F%2Fceramicartsdaily.org%2Fceramic-glaze-recipes%2Fmid-range-glaze-recipes%2Frecoloring-a-classic-trying-new-colorants-in-a-classic-pottery-glaze-recipe-can-lead-to-some-great-results%2F&ei=HEXzU5wPwv3JBJCbgYgM&usg=AFQjCNEZNT3qjexGXdziCkSuqu6jOExqtw&sig2=yEKovpVkiYo6de684dAiZg

 

FALLS CREEK SHINO (CONE6)

 

GB               18.7%

Lith Carb.     6.5%

Soda Feld     9.4%

Alberta Slip  56.1%

Silica            9.3%

 

Zircopax       9.4%

Tin Ox          4.7%

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You have a lot of Alberta slip in that glaze. The function of Zircopax and Tin are as opacafiers to make a clear glaze into a white matt.

Since you are not using these materials in that capacity, I would lose the tin and substitute zirco for it.

I am just surmising. you would have to do a test, but it looks like the tin is extraneous.

TJR.

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Is this for Oxidation?

I have used Malcolm Davis's Shino for ^6 reduction.

It works at that temperature as well as ^10. Sorry. I see you are doing Oxidation. This won't work for you but it does have fewer ingredients.

Marcia

Malcolm Davis Shino
Cone 10 Redux 

Nepheline Syenite 40.91
Soda Ash 17.27 
Kona F-4 Soda Feldspar 9.82 
Edgar Plastic Kaolin 18.18 
Om #4 Kentucky Ball Clay 13.82 


Malcolm Davis is an amazing potter who has developed a number of carbon trap shinos. He does seminars which include his shinos. If anyone has attended one of his seminars and can share a few bits of Shino wisdom, I would love to read it.

Photos of his work here: http://www.akardesign.com/art/ceramics/previousshows/davisshow.htm

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its a great glaze follow directions

i got help here when i first made it

its a standard at community studio where im at now

i did lower the lithium to 5 and upped the silica on someones suggestion.

wait to get the tin.

 

and its not a shino by any stretch,  falls creek shino IS NOT a shino

 

author would prefer to call it oatmeal red.

 

the malcom davis shinos are pretty amazing,  and i recently used the RED malcom davis..... amazing.

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No experience with this glaze, but FYI

 

Effect of different colourants

http://ceramicartsdaily.org/ceramic-glaze-recipes/mid-range-glaze-recipes/recoloring-a-classic-trying-new-colorants-in-a-classic-pottery-glaze-recipe-can-lead-to-some-great-results/

 

Note from the originator, who now prefers the name Randy's Oatmeal Rust.

http://www.potters.org/subject72393.htm

Quote: Another interesting thing though, the tests with only one opacifier didn't break
red the way it does with both tin and superpax.

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