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Acceptability and Tolerances
There is no general definition of acceptability but it may be considered that corresponds to acceptable deviations, whereby the observer does not perceive any difference.
The limits of acceptability are expressed in colorimetric values by tolerances.

Industrial experience has shown that the visual analysis of any colour difference successively concerns:
The tonality difference (tint)
The saturation difference (chroma)
The lightness difference

It is important to note that the acceptability and the tolerance must take
all of the elements of the colour difference (all of the Δ) into account.
A colour of acceptable tonality that differs in saturation and lightness may be visually acceptable, whereas its ΔE* value would lead to it being rejected.
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