Composition: Co Zn Si References: Can be used as a body stain. Maximum temperature 2300 F. May be used with our without Zinc. Mason Stains Home Page 6313 Medium Blue - 1/4 pound 6313-14$6.84 Medium Blue - 1/2 pound 6313-12$12.80 Medium Blue - 1 pound 6313-1$23.83 Medium Blue - 5 pounds 6313-5$110.30