Is the Kodak Gray card "spectrally neutral"?

Does anyone know if the Kodak R-27 18% gray card is spectrally neutral? How about when lit with different illuminants? Would it be appropriate for setting WB in ACR?
I'm more interested in actual measurements or well-documented articles than opinions.
Thanks, Lou

Jeff Schewe wrote: He's wrong...simple as that. An 18% graycard is too dark to be used optimally for white balance. There's a reason why it's called "white balance". You want to have the balance determine much further up the tone scale than a middle gray. The second to the lightest (or even the lightest if the exposure is down a bit) patch is what was used to develop the Camera Raw White Balance tool. It's foolish to ignore that...
You shouldn't use the N1 patch (brighest patch) of the ColorChecker, since it is not spectrally neutral. It is difficult to produce paint that is spectrally neutral at that reflection density. See Bruce Lindbloom's Color Checker Calculator for typical values. The remaining patches are pretty neutral. N2 is best for white balance, since the camera will collect more photons and the signal:noise will be better. If the camera has good noise characteristics, a good white balance at base ISO can be obtained from the N4 square, which is midgray (L* = 51). However, at high ISO or with cameras with worse S:N the WB may not be optimal.
For example, with the Nikon D3 at base ISO (200), here is the white balance from N4 (patch 22). The RGB values for the neutral patches are shown in the ACR readout at the top.
Here are the results for N2, patch 20:
N1 (patch 19):
And N6 (patch 24):
With the exception of WB with N1 (which is not specrtally neutral), the RBG values are very close at all levels when WB is performed with the other patches.
I don't have a spectrophotometer to read my Kodak gray card, but gray balancing on this card produces suboptimal results as shown here:

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An: [email protected]
Betreff: I want to use a gray card shot in ACR to multiple photos. Poss into the Elements or only in PS?
Re: I want to use a gray card shot in ACR to multiple photos. Poss into the Elements or only in PS?
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I am studying chest feather coloration in Barn Swallows, and take pictures of swallow chests against a white background with gridlines, while always including a gray card in the image. In order to evaluate chest color between birds, the lighting, exposure and white balance for all images must be identical.
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russ
altadena, ca

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Is the Kodak Gray card "spectrally neutral"?

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