I have seen zinc listed in lots of MSDSs for printing inks.
Bill Bilkovich, EQC
> Currently, I am working with a silk screening plant which uses water
> based inks and no solvents during clean up, yet they are discharging
> excess Zinc and Copper into waste water. The Copper is most likely from
> the pigments, but it is a mystery as to the source of the Zinc. The
> majority of the water discharged is used in cooling. I am seeking any
> suggestions as to possible sources of Zinc in fabric printing operations.