Supplier Page from Thermo Fisher Scientific for 1,2-Naphthoquinone-4-sulfonic acid sodium salt, 97%
4-Ethylresorcinol, 98% from Thermo Fisher Scientific
Ethyl acetoacetate, 99%, pure from Thermo Fisher Scientific
Ethyl butyrate, 99% from Thermo Fisher Scientific
Fluorescein, pure from Thermo Fisher Scientific