Streak platets are ideally sized for filed or lab testing. to test, rub across the specimen to determine streak color; use black for light minerals. size: 2inchx2inch. package of 10
Polyurethane Foam kit, to explain how when two viscous liquids are mixed together, they initiate a reaction producing a light weight polyurethane foam, Includes: 1 x 500ml Polyurethane Foam System, Part A (Mixture), 1 x 500ml Polyurethane Foam System, Part B (Mixture)