18% gray card question

[Joel Alpers <joela@xxxxxxxx>]

Hello all -

I've been doing some Zone system calibration on
non-infrared B/W film, and would like to use some 
of those techniques with IR film.

But I have one question - does anyone know if a 
Kodak 18% gray card is still 18% gray in the range
of IR, say 650-900 nm???

Thanks -

Joel.
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