FAQ: What are the "reference" and "samples" in the Gray Change and Gray Stain test method described in the HunterLab application note?

Answer:

The Gray Change and Gray Stain scales are each based on a gray set of visual paint chips that can be purchased from AATCC (www.aatcc.org). Both scales are based on small differences between a product standard and lot sample of any color in comparison to these two gray scales (5 = no difference; 1 = most difference).

In HunterLab software, there is an instrumental correlation to Gray Color Change [GCC] and Gray Stain Change {GSC} for objective measurement of product color in terms of these two scales.

• You would configure the display the GCC or GSC in the Color Data View.
• Read in a product standard to compare to.
• Read in a lot sample and the corresponding GCC/GSC between 5 and 1 would be displayed.

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