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DIN EN 1557:1997
Surface active agents - Colorimetric characterization of optically clear coloured liquids (products) as X, Y, Z tristimulus values in transmission
The document specifies a method for the colorimetric characterization of optically clear, slightly tinted liquids (products) by broad-band measurement of pure transmittance with tristimulus value measuring filters as T<(Index)X>, T<(Index)Y>, T<(Index)Z>.
Deutsches Institut für Normung [din]