Supplier Page from Thermo Fisher Scientific for Copper slug, 6.35mm (0.25in) dia x 6.35mm (0.25in) length, Puratronic:r, 99.9999% (metals basis)
1,2-Ethanedithiol, 95% from Thermo Fisher Scientific
Ethyl 4-bromocrotonate, 75%, tech from Thermo Fisher Scientific
Ethyl chloroacetate, 99% from Thermo Fisher Scientific
Fluorescein, pure from Thermo Fisher Scientific