As well as getting a different perspective about a banknote design and layout, UV can also be a good basic test for other certain/specific notes. I eventually proved.....against some other 'experts' that a piece was modern /a forgery, first by using UV on a known original and comparing it to a suspect note. We then had XRF testing (x-ray florescence) performed which proved it. Hope that helps? The process was quite long and drawn out, so I doubt I will ever do something similar again.