Quote:
Originally Posted by Ted Kendall
Having just taken young son to an optician chain to be assessed for his competition licence, I was appalled to see practitioners swapping their faded Ishihara card sets to try and get reliable results - judging by the condition of the sleeves, some of these were thirty years old. Evidently the hues degrade in an unpredictable fashion.
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Printers’ Pantone colour swatch books were only considered reliable for a few years. Even if kept in a drawer chemical changes in the paper will degrade the colours, especially the lighter ones.