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That's really interesting Garth. I wouldn't have guessed that the gray hue would vary between manufacturer's, as that would seem to negate their purpose? My first gray card was probably 20 years old (it was my Dad's, who was a smoker), and it had yellowed over time. The new one is much grayer (blue gray). I keep it stored face-down, so it doesn't fade from sunlight.
What brand/style of white paper do you use? Have you tried taking a picture of a painting, and including in the picture a gray card and the white sheet of paper you did your PRE balance with (just sitting them on top of the canvas or taping them to whatever the canvas is resting on). Then in Photoshop Elements, using the Enhance/Adjust Color/Color Balance and clicking on the gray card and the white sheet. Does the color of your painting change significantly with the gray card vs. the white sheet? Ideally the color of the painting won't change at all when you click on whatever you used to set your white balance, but I'd be curious to see how much it differs (or doesn't) between the gray card and white sheet.
Holly
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