"It is great that there is a porcelain being produced in New Zealand which has the qualities of whiteness and translucency I require for my work. It stands up to the demands of firing at high temperatures. I have used it for large sculptural works as well as fine thrown tableware and it performs extremely well."

Raewyn Atkinson


"What was a big surprise to see how well the high-fire Porcelain threw and then fired.  The colour response is beautiful and a couple of my regular glazes which craze normally fit like a glove.  Very translucent though and the real surprise for me is how stable they remained in the firing with NO distortion.  One bowl was sitting on a shelf that broke in the test kiln and was at about 20 degrees of level yet remained round.  My regular stonewares would have sagged and distorted way out of shape. I can’t see any factors that need improving with this fine material!"

Neil Grant - Otago Polytech


“After working with a number of white clays in recent years I have now changed the whole studio to Mid-Fire Porcelain made by Primo Clays. It is a completely universal clay. The body throws well from small delicate pieces through to bottles of over a metre. It is versatile and we use it in its finest translucent form through to large paper clay structures.

It is extremely stable and supports a wide range of glazes including the crazed glazes I am currently developing. In fact it has solved a number of my firing problems and I am very happy to recommend it.”

Peter Collis



Black Ice

Black Ice

Black Ice is a black porcelain body noted for its beautiful graphite colour. It has high plasticity, which makes it ideal for wheel throwing and modelling. Its formula is very stable and provides secure firing range between Cone 6 and Cone 7 ( oxidizing atmosphere). Suitable for tableware ( food safe) according to ISO 6486:1999. Available in extruded body ( moist form). Supplied in a practical cylindrical format with double packaging.

Firing range. Cone 6-7
Biscuit: Cone 06
Water content : 20%
Plasticity (IP Atterberg):11
Carbonate content (CaCO3): 0%
Drying Shrinkage: 5.4 %
Firing Shrinkage at Cone 6 : 10.3 %
Porosity ( water absorption) at Cone 6 : 0.0%
Dry bending strength: 3.1 N/mm2
Fired bending strength at Cone 6: 39.8 N/mm2
Thermal coefficient (a25-500 C): 54.3X10-7C-1