Supplier Page from Thermo Fisher Scientific for 4-(4-Anilinophenylazo)benzenesulfonic acid sodium salt, indicator grade
Ethyl 2-hydroxyethyl sulfide, 98% from Thermo Fisher Scientific
Ethylenediaminetetraacetic acid, 99%, pure from Thermo Fisher Scientific
Ethylmercurithiosalicylic acid, sodium salt, 97.0-101.0% from Thermo Fisher Scientific
Fluorescein, pure from Thermo Fisher Scientific