The ceramic produced in Prof. Igor Lubomirsky's lab at the Weizmann Institute of Science seemed too good to be true. It belongs to a class of materials that are the backbone of many essential technologies but that unfortunately also create an environmental problem because they usually contain lead, which is highly toxic.
Tldr: piezos use lead. This will remove lead from all injet print heads (including carts that have the head built in and are disposable) and phone cameras.