Re: Not much of a chemist then?
>>The polymer in virtually all of the world’s plastic bills is made by a single Australian company, Innovia Security.
Innovia are the makers of Guardian, a substrate used to manufacture the polymer currency of 24 countries, including Canada, the United Kingdom, Mexico and New Zealand.
Tallow does not appear to be a stand-alone or critical ingredient in Guardian, but the by-product got into the substrate because it is used in processing by Innovia’s resin suppliers.<<
So it's in there accidentally by the sound of it. As such probably not going to involve masses of retesting to take it out.