Supplier Page from Thermo Fisher Scientific for ColorpHast:r pH Strips, Narrow, one square with single indicator on each strip, 0-2.5 pH range
Estrone, 99+% from Thermo Fisher Scientific
Ethylenediaminetetraacetic acid, 99%, pure from Thermo Fisher Scientific
Ethyltriphenylphosphonium bromide, 98% from Thermo Fisher Scientific
Fluorescein, pure from Thermo Fisher Scientific