Colour differentiation

Colour differentiation is most influenced by the contrast in brightness, or light-dark contrast. Brightness is the amount of white that is present in a colour. Pairing black with white provides the greatest brightness contrast, since white has a 100% brightness value whereas black has a brightness value of 0%.

This attribute is used in magnetic particle inspection when white background paint and black ink are used, giving the optimum colour differentiation. So, why are visible penetrants typically red or sometimes blue? Would it be better to have a black penetrant, which would also reduce the need for red and blue colour vision perception?

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