Primo Pro Nigra2002 Black Stoneware Clay is manufactured by a reputable European supplier and widely sold throughout Europe. We have the manufacturers absolute assurance that this body (pigmented with manufactured stains) is safe to use and does not contain Manganese Oxide.
Primo Pro Nigra2002 Black Stoneware Clay is a stoneware body. It is suitable for plastic forming methods.
Chamotte proportion: 20 %. chamotte size range: 0 - 0.2 mm ( black chamotte )
Firing Colour: black
Recommended Firing Temperature Range: 1000-1240ºC
Technical Data (typical values)
UNFIRED
Moisture: 20.0% plastic
Loss of Ignition: 5.0%
Wet to Dry Shrinkage: 6.8% plastic properties
FIRED
Specimen Firing Temperature [ºC] 1200
Dry to Fired Shrinkage [%] 7.0
Water Absorption [%] 2.5
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(5.00)Gaby Weber Published Thursday, 14 October 2021 Great clay to work with. If you want to do a black clay project. I get a great dark black when I fire as high as cone 5 (1190). Did inquire at the producer and they assured me as CCG informed later on as well that it isn't toxic to work with. It is made of black stain. This clay is used as a school clay in Germany so I think there is no danger here to use it. A bit tricky with clear glaze. Don't apply it too thick or if problem persists try with a zinc free one. Tests beforehand are always good :-).
