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Proceedings Paper

Visual and optical evaluation of bank notes in circulation
Author(s): Sara Church; Martine Lacelle; Theodoros Garanzotis
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Paper Abstract

A method for comparing quality of bank notes in circulation based on both a subjective visual sorting technique and on quantitative wear evaluations is described and applied to circulated Canadian bank notes. The sample notes, which were part of a $5 circulation trial, issued over a 4 to 6 week period, had been in circulation for roughly 6 months. Notes were first sorted visually into four defined substrate categories (No Edge Wear, Corner Folds, Minimal Edge Wear and Edge Wear) and four surface wear categories (None, Low, Medium and High). Samples of each category were tested at Crane and Co. using a range of physical and optical techniques: air resistance, air permeability, stiffness deflection, double folds, gray scale, brightness, perimeter length, and top/bottom mean and maximum deviations. The visual sort showed that neither soiling nor ink loss are the major wear problems for bank notes in Canada. However, the substrate does become tattered and worn. The mechanical and optical wear tests show that most of the parameters change logically as the soil level increases. The changes for other parameters are less clear as a function of wear categories, but are relatively consistent in distinguishing between the No Edge Wear and Edge Wear. Impact of wear on the effectiveness of security features will also be described.

Paper Details

Date Published: 9 February 2006
PDF: 11 pages
Proc. SPIE 6075, Optical Security and Counterfeit Deterrence Techniques VI, 607506 (9 February 2006); doi: 10.1117/12.648407
Show Author Affiliations
Sara Church, Bank of Canada (Canada)
Martine Lacelle, Bank of Canada (Canada)
Theodoros Garanzotis, Bank of Canada (Canada)

Published in SPIE Proceedings Vol. 6075:
Optical Security and Counterfeit Deterrence Techniques VI
Rudolf L. van Renesse, Editor(s)

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