This story of the tallow in bank notes fascinates. As far as I can work it back the tallow is a source of stearates, which are used as lubricants and declumping agents and lots of other stuff.
I’m not sure if tallow is the only source or just one of alternatives. And again, as far as I can see, it seems to be part of all polyethylene. And possible of other plastics too?
The question I’d like an answer to though, is, if it’s the main or usual source, this tallow, of the stearates which end up aiding in making the plastics of the bristles on a toothbrush?