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dhPotter

Making Clay Stamps

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Making my own texture stamps I have always only bisque fired them before using them.

Is there a reason to NOT fire the stamps to the clay's maturity?

As a single firer I don't want to do a special bisque firing for a few stamps. Also, I don't need anymore calcined EPK.

  

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not that I can think of. not firing to maturity will make them not as hard and they will soak up moisture more but firing to maturity makes them their hardest. seems like the way to go.

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I have found that a non-porous ceramic stamp is not as versatile as a bisqued stamp.  I use stamps while throwing as well as on soft slabs work and leather hard work.  If the stamp is only used on leather hard work the non-porous stamps make clean crisp impressions, but they tend to stick to the moist clay;  porous stamps work well on both.   

If I were single firing to cone 5-6 I would consider either using a cone 10+ clay for stamps and fire them to cone 5-6, or I would add 30-40 % fire clay to the regular ware clay for making the stamps so that when fired to cone 5-6 the stamps would remain porous.  If I were single firing to cone 10 I definitely add fire clay to my regular clay so that the stamps would be porous.  

LT
 

Edited by Magnolia Mud Research
fix grammar and spelling

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@dhPotter, could mix up a thick cone 10 - 12 slip, pour it onto plaster to dry it out then wedge it up. If you are only making a few stamps 500 grams or so should be plenty. I think this would still be somewhat porous at cone 6 but not as porous as bisque. Any ball clay 25, EPK 25, Custer 25, Silica 25. (and I think you have all those ingredients)

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On 7/31/2018 at 4:04 AM, Pres said:

I use wood, bisque ceramic, plastic and other items to stamp into the clay before shaping, With all of these stamps because of the wet clay, I dip the stamp into my throwing water and stamp into the pot. . . release is fine, with no sticking.

 

best,

Pres

For non-porous stamps you can also dip into WD40, or use cling flim over to get a softer edge.

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