The observance of color within the photochromatic interval has been shown to be possible. By pre‐stimulating the subjects in a dark‐adapted state, using Kodak Wratten Color Filters No. 70 (red), No. 73 (yellow) or No. 74 (green), and test‐stimulating 30 sec. later with yellow, green, or blue filters at levels of intensity between the specific and absolute thresholds for these filters, it was found that they observed a blue or violet