The imprint on this check is listed as K4, gray, in the Castenholz Field Guides to Revenue Stamped Paper. Bill Castenholz warns that there are what he calls "color changelings" that might be mistaken for other shades. Eric Jackson maintains that the color is olive, and that the imprint is a K11. I lean toward calling it gray.

This example from Virginia has never been classified as anything but gray.

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