Supplier Page from Thermo Fisher Scientific for Niobium foil, 0.127mm (0.005in) thick, 99.97% (metals basis excluding Ta), Ta :<0.06%
2-Ethyl-1-hexanol, 99% from Thermo Fisher Scientific
2-Ethylaniline, 98% from Thermo Fisher Scientific
Esculin hydrate, 97% from Thermo Fisher Scientific
Ethyltriphenylphosphonium bromide, 98% from Thermo Fisher Scientific