Banknote substrate

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http://www.bde.es/webbde/en/secciones/informes/libros_virtuales/billetaria/billetaria_9_en/document.pdf

Here a document for bancnote substrates

A picture from a HYBRID bancnotes (Louisenthal - Germany)

{http://forum.transylvanian-numismatics.com/files/hybrid_151.jpg}