CAUTION: Some of these materials are toxic in their dry unfired or fired state. You should always use a dust mask when working with these materials. We have an inexpensive, Toxic Dust Mask available. Also Material Safety Data Sheets are available on request or can be downloaded from MSDS Search. These materials have always been potentially harmful, so let’s get serious about safe handling. bo-bu-co Borax, Powder 1 pound bor1$1.70 Burnt Umber 1 pound bu1$2.60 Chrome Oxide Green 1/2 pound crox1$4.82 5 pounds bor5$7.00 5 pounds bu5$11.75 1 pound cro21$8.75 10 pounds bor10$13.30 10 pounds bu10$21.50 5 pounds crox5$41.55 25 pounds bo25$31.25 25 pounds bu25$48.75 10 pounds crox10$79.00