There are two varieties of the substrate of the new 20 Pounds banknote (GBP-BoE20.5).
The purple ink surrounding the window is clear on notes with the De La Rue substrate, but slightly mottled in the CCL (formerly Innovia) substrate. The polymer supply contract was split 75/25% between CCL and De La Rue, though all the notes were actually produced by De La Rue.”
Courtesy Gabriel Numismatic Market, LLC.
Source: International Bank Note Society Journal Vol. 59, Nbr. 2, 2020 pg. 72.
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