MazamaWares Posted August 3, 2017 Report Share Posted August 3, 2017 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! Link to comment Share on other sites More sharing options...
Pieter Mostert Posted August 3, 2017 Report Share Posted August 3, 2017 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. Link to comment Share on other sites More sharing options...
glazenerd Posted August 3, 2017 Report Share Posted August 3, 2017 Once you cross cone 3, deeper shades of iron brown. Link to comment Share on other sites More sharing options...
neilestrick Posted August 4, 2017 Report Share Posted August 4, 2017 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. Link to comment Share on other sites More sharing options...
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