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MazamaWares

Mid-Range Red Casting Slip Possible?

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Hi all!

 

The company we work with that formulates our slip is having difficulties achieving the necessary properties for casting.

The issues are due to the fact that they are taking a plastic throwing body, and are trying to convert it into a casting slip.

 

Due to the fact that we have little control of that formulation, I do not know the exact recipe for the slip.

 

We are just curious how difficult it is to create a Mid-Range Red Casting Slip that is properly flocculated, and casts evenly with no issues.

After firing, the color we are trying to achieve is a Red-Orange, preferably something that withstands thermal shock since we are creating drinking vessels. 

 

 

Does anyone have any recipes, or reasons why a high-iron casting slip acts weird?

 

Thank you all for your time!

 

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There's a lot of good info in this digitalfire article. Sounds like it will be tricky to get what you want.

 

EDIT: I just realised the article concerns low-fire casting slips, whereas you're looking for a midfire one, but the points it makes about needing to source the iron from a clay, and losing the rich red colour as you approach vitrification still hold.

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The orange-red clays I have seen for cone 6 use lithium (spodumene) to achieve their color, which creates issues with even fired color as well as glaze fit problems. As Nerd said, by increasing the iron in a typical cone 6 body, you're going to go into shades of tan and then darker red-browns, not orange.

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