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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What is a Y Brightness? Beta Reflectance Factor? Reflection Coefficient?

FAQ: What is a Y Brightness/Luminance?

FAQ: What is a Beta (ß) Reflectance or Luminance Factor for Brightness?

FAQ: What is a Reflection Coefficient (0-1)?

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