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mansie131

Iron Oxide Slip

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Hi,

 

i'm having trouble with iron oxide slip applied at the greenware stage.

 

i've noticed that a thin layer gives varied colours and a thick layer gives either black or nothing- does it burn off? (i use a transparent glaze over this) additionally, a lot of the colour washes out on cleaning after bisque. what's going wrong and how can i stablize the slip to give me a solid black?

 

i use stoneware fired to cone 09 bisque and cone 6 glaze. 

 

thanks!

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Hmmmm....

 

What color of iron?  I've only tried black iron oxide, but had no issue getting it to be black...ish... More of a dark grey, but still nice.

 

Are you using the iron oxide, you'd add to glaze recipes, or a mason stain?  I've noticed that some of the black mason stains note that the zinc in them will lead to more brownish colors, than black.

 

Also, I had a black iron oxide, that would turn greenish, when covered with Amaco's Clear Transparent.  

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are you using your clay slurry from throwing plus the iron oxide or are you following some recipe with lots of ingredients?  or are you actually making a wash with just the iron and water?

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I spoke too soon with my slip.  Put a clear over the pieces I used it on, and it turned a dark brown.  I still like how it looks, especially on a piece where I did a sodium silicate crackle.

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