We are offering ruthenium red. For microscopy cl6h42n14o2ru3.4h2o m.w. 858.42 (ru content 34% approx stain for electromicroscopy) minimum assay 99% maximum limits of impurities: palladium(pd) 0.005% rhodium(rh) 0.005% cas no: 11103-72-3 un no. Nr hs code : 2843 90 19 s : 22-2425 f :