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Left: Traditional blue material, could be 20 years old. 
Center: A shipment we got in Feb 2014. 
Right: A shipment in Oct 2014. 
Front: 10 gram balls prepared for a melt-flow GBFL test. 
The blue powder is the most difficult to form (therefore the least plastic) after water has been added, the tan one is the easiest.
| Materials | 
Cornwall Stone
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