This is the binder for the R&R Platinum,  The acid-based binder gets mixed with investment for casting platinum alloys. This investment and binder provide platinum casters with a consistent, acid-based mixture that does not separate, resulting in smoother, more consistent casting surface finish than any other two-part platinum product.   Binder ships as a Hazardous item and additional fees will apply. Investment supplied in convenient easy to carry bliss box. Made in the USA.