Tuesday, 3 April 2012

Reliable Cone 6 Glaze - Chrome Tin Red

Flower Sculpture Glazed in Chrome Tin Red at Cone 6

This flower sculpture was made some months ago now and intended to be used on a steel rod in the garden. However, it looks just a nice sitting on a table. I have glazed this piece using a Cone 6 glaze called Chrome Tin Red. Its one of the most reliable cone 6 glazes I have ever used and you can experiment as I have done, by over spraying with other glazes to see what happens. Here I have used 'Fake Blue Ash' and a glaze called 'Nutmeg'. I used a white earthenware paperclay from 'Blackwattle Pottery' located in Ingleburn NSW. John manufactures his own clays onsite and I have found them to be excellent. The white earthenware clay I buy from John are recommended to be fired to 1150 deg c from memory, but I find it fires to 1200c with no issues to date. I have also used his 'White Grog Raku' clay for my raku pieces.

Here is the recipe for 'Chrome Tin Red' Cone 6 Glaze' - sometimes known as 'Raspberry Red' or 'Burgundy Red'

 
Whiting                       21.00 grams
Gerstley Borate            8.00
Edgar Plastic Kaolin     9.00
Talc                              4.00
Custer Feldspar         31.00
Ferro Frit 3134             9.00
Silica                          18.00
Tin oxide                      5.00
Chrome oxide              0.2
Total                        105.20 grams 

 
 
 
 
 

 
Here is another Chrome Tin Red/Pink glaze that is also reliable.

'Chrome Tin Red/Pink' Cone 6 (Glossy)

Gerstley Borate            21.00 grams
Nepheline Syenite       16.00
Edgar Plastic Kaolin    11.00
Whiting                        20.00
Silica                           32.00
Tin oxide                     05.00
Chrome oxide                0.2
Total                         105.20 grams

 
 
 
 
 

No fussy around with the firing of this glaze and I have found that it fires well no matter what the firing schedule, but I would recommend a hold for 1/2 hr at around 900c on the way back down. I have even used this glaze in single firing with good results. Good luck and drop me a line to let me know what you think of this glaze.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


  

19 comments:

  1. Do you have a clear coat over the top? Or is the finish that of the chrome tin red glaze itself?

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  2. Hi Amos, What you see is the chrome tin red glaze. Its a very high gloss glaze. The purplish/blue colour you see in areas would be from the 'fake blue ash' glaze that I sprayed over the chrome tin red glaze.

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    1. Thank you for the recipe and info, I love the color ... I have been looking for a good red and will try yours... I have just finished a large test on recipe re-dos and love the results I have found. I make big bird houses and need a collection of reliables to get to work on the coloring. And the purple hue is amazing.
      Thanks again...

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  3. Thank you for the clarification. Do you happen to have the fake blue ash glaze recipe? I am hoping that the addition of a small amount of aluminium will not mat the glaze too much.

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  4. Great site with much information. Thank you.
    Anderson Pottery, Rockport, Texas

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    1. No problem Mike. Happy to share. :)

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  5. Kevin Austin Korb14 May 2013 at 06:07

    You Rock...I love this glaze. I used it on a casserole dish for a Mother's Day gift

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  6. Hi Jan
    love your red glaze. Can you please share your fake ash glaze recipe too. I simply love the sparkle of blue over the red. Thanks again

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  7. Hi Jan, the red of this glaze is beautiful. Judging from the materials list sounds food safe. But would like confirmation before using it on dishes to be used with food. Thanks for sharing.

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  8. Hi wrensfield. I use this glaze on clay the matures or vitrifies at cone 6 and have also done the leaching test with lemon overnight and for the clay I use, it has been fine. However I do not use in the oven or microwave, or the dishwasher, so cannot comment about that. It does not craze on the clay I have used, but it would be a matter of doing your own tests as per usual to make sure.

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  9. Is this oxidation or reduction firing?

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  10. Hi Kaia. It is oxidation

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  11. Also, is Chrome Oxide 20%? If is, the total is 125%. If formula is in grams, then what is batch size? I'm new at making own glazes, so a little confused here. TY

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    1. Chrome is 0.2%
      Check the decimal point!
      Good luck!

      Formula is in percent, it can be grams, ounces, kilos, pounds, tons, whatever you want. So you choose what size batch you want, divide by one hundred, and the recipe is expressed in 1/100ths of whatever you choose.

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  12. I have had a problem with my chrome-tin red glazes. If I don't apply the glaze thick enough or fire to just the right temperature, the red coloring can fade to a pasty white or tan that is very unattractive. The inside of bowls can be fine, but the outside is all faded out. Have you had this experience with these glaze formulas?

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    1. I'd like the answer to this as well. The glaze itself has a thick consistency, but when fired (to cone 6, oxidation), it washes out to a streaky white and raspberry color.

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    2. Mike and Mamosa,

      I sprayed these glazes onto white earthenware clay, so a nice coat is applied this way with little runs or drips. Also, because I am using earthenware and midfire clays, they are vitrified at this temp as the clay body itself is melting so to speak. This may make a difference. Mike, to me it sounds like you are not reaching the right temp for proper glaze melting/maturation? Or, perhaps the glaze is too thick. Hard to say without seeing a pic.

      Mamosa, Perhaps the white streaky appearance you are seeing could be thicker areas of glaze or runs? I fired to midfire temps (Cone 5-6) and not a particularly thick application (perhaps 3-4mm). Where this glaze is thicker, it looks white and breaks on edges a white colour (see above pic, edges of petals look white).

      As we know, firing temps and times are pretty hit and miss at times unless you have a programmable kiln (I don't) and temps vary within the kiln itself. Even in my own kiln, the difference between my top and bottom shelf can be a cone or two. Perhaps try a hold at 1200'c to see if that helps. I can't do that with my kiln as its manual and it shuts of at the set temp.

      Hope this helps. I am not a glazing expert, but perhaps it would also depend on glaze material suppliers. Glaze materials are sourced in different places around the world and this would effect the end result too. TEST on test tiles or test bowls first before using on special pieces.

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    3. It's the other way around. Edges are thin, they break white, thicker is red. I have run tests, single dip is white, doubled and treble dipped areas are red.

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  13. Hello!
    Thank you for all the info! We made this at school. It turned out Maroon. Any ideas??

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