The Oracle Project Test Batches – offered direct from the glass maker to the artisan in small batches, sold by the pound, wrapped in paper.  Labeled with batch date and formula number, with a suffix to indicate glass family type example, 740.opl.

I have thoroughly enjoyed researching, developing, batching, testing, and using these colors, and it is my sincere hope that these glasses enhance your flameworking experience.
-Jed at Double Helix Glassworks