Do you have a source for Magnesium Carbonate powder as top-of-scale?

For measuring the brightness of some materials, some dated industrial methods cite a Magnesium Carbonate block standard to be set to Y = 100% in reflectance. This is a very old top-of-scale standard and HunterLab does not recommend using it.

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Contrast Ratio Opacity

When used with industrial and commercial products, there is more than one definition of “opacity” as an optical property.

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