Draper announces its TecVision Engineered Screen Technology lineup is certified by the Imaging Science Foundation (ISF) for "excellent colour reproduction and fidelity" at ISE 2015.
Such certification requires the screen to have flat spectral response-- or colour fidelity. In other words, the screen cannot affect the image enough for the human eye to perceive.
Traditional projection screens use blue tints to fool the human eye that images are brighter than they actually are. However this affects the greens and reds required to build colour-accurate images, at least according to Draper.