I actually needed a pair of red and blue 2" x 2" squares to use for spectral comparison of lighting schemes, so they're overkill (and still cheaper than many other) options), but the red and blue 2-inch squares work great for my purpose, and after I cut a strip off each sheet, I gave the remaining 8-1/2 x 9 sheets to a photographer friend. Note: The plates have a very thin protective plastic film on each side which must be removed before use.
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