Supplier Page from Thermo Fisher Scientific for Tartrazine
8-Hydroxyquinoline, ACS reagent from Thermo Fisher Scientific
Benzalkonium chloride, alkyl distribution C8-C16, 50 wt% aqueous solution from Thermo Fisher Scientific
Hydroquinone, 99% from Thermo Fisher Scientific
L-Alanine, 99% from Thermo Fisher Scientific