Manufacture begins with canvassing potential customers about desired characteristics for new standards. Ore with these characteristics is sourced from a mine or exploration project. The ore is crushed, then dry-milled and air classified to 100% <54µ. This fine powder is mixed in a blender for 14 hours and then split down into numbered 1 kg tubs. These lots are sampled for quality control and for round robin analysis. Quality control for a normal sized batch comprises sampling 30 tubs selected from the whole stream. Round robin samples are selected the same way, so that one laboratory will receive samples from the beginning, end, and from throughout the batch.