Supplier Page from Thermo Fisher Scientific for Selenourea, 99.97% (metals basis)
2-Mercaptobenzothiazole, 95% from Thermo Fisher Scientific
Dicalite® speed plus, Diatomaceous filter-aid from Thermo Fisher Scientific
Iron(III) acetylacetonate, 99+% from Thermo Fisher Scientific
L(+)-Histidine methyl ester dihydrochloride, 97% from Thermo Fisher Scientific