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Ceramic Pencil- How Much Oxide As A Colorant?


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Hello,

 

I'd like to experiment with making my own ceramic pencils. I found two recipes that caught my eye in an article by Robin Hopper on Ceramic Arts Daily:

 

Ceramic Pencil Slip Recipe

White firing ball clay50%

Potash feldspar25

Silica25

100%

Add:

Macaloid (or 5% bentonite)3%

 

Colorant (maximum)15%

 

and a recipe for ceramic ink:

 

Black Ceramic Ink Recipe   Calcium borate 30%   Potash feldspar 30   Ball clay 25   Silica 15     100% Add: Bentonite 5%   Mason Stain 6600 or other black stain 10%
 

 

Now, I would like to try different ways of reaching a black pencil: with a black stain, as well as wish metal oxides, alone or combined with the stain. I'd like to reach a really "black" black :), which will stay clear and defined under glaze. Could someone please suggest which oxides ( alone or combined )  I should try and at which percents?  what are the highest percents of metal oxides I can use if the pencils will be used on food wares? Thank you and thanks for reading my somewhat lengthy post! 

Michelle

 

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