November 29, 2021, 04:50:13 AM
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Topic: Color measurement standards, L*a*b*  (Read 143 times)

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Offline Reddart

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Color measurement standards, L*a*b*
« on: November 19, 2021, 09:04:37 AM »
Does anyone have a suggestion of a common stable material that could be used to make solutions to measure transmissive color? We are having inconsistencies between our lab and a sister lab in measuring L*a*b* data on solutions of the same batch of material using colorimeters (different manufacturers instruments).

Offline Corribus

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Re: Color measurement standards, L*a*b*
« Reply #1 on: November 19, 2021, 11:25:04 AM »
Have you searched around for certified reference standards, e.g., https://www.paragon-sci.com/astm-1-colour-reference-standard.html

Also you may want to make sure you're following a standardized procedure for color measurements, i.e., https://www.astm.org/Standards/D2244.htm

Not sure what "inconsistencies" you are having but you will always have some variation in measurements between labs. It's a matter of what you deem to be acceptable variation. Question is: is the inconsistency random or is it a systematic error? This can help you diagnose the origin of the variation.
What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

Offline phth

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Re: Color measurement standards, L*a*b*
« Reply #2 on: November 19, 2021, 08:24:55 PM »
Is the water in both labs certified HPLC or "deionized"?

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