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WHAT IS A STAINED NOTE ?
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After many years spent exploring various avenues of neutralising notes, manufacturers have opted for the procedure of staining, thanks to its characteristics of speed of execution, effective neutralisation, resistance to cleaning attempts and the lack of danger for those that may handle stained notes.
Staining is generally done by deluging the notes with a liquid dye. Most often, the dye spreads from the outside edges of the note to the centre. If there are one or two small stains in the centre of the note and the edges are unaffected, it is probably an accidental stain. The original colour of dyes is usually purple, red or sometimes black.
However, it is possible that criminals may try to wash the notes, but without succeeding, which can modify the colour due to a reaction with the chemical products used for the attempted cleaning. Thus, brown, blue or green stains, or a faded section of the note’s own colour scheme, can generally be found.
