I'm sure it does. While I have not attempted to measure it for in camera use, I do have some anecdotal observations to report. The liner of the light mixing box in my enlarger had yellowed with age. When I relined it with new material, I immediately noticed that the light striking the baseboard was considerably less yellow. All of the papers I'd tested for speed with a step wedge required about 1 stop less exposure for a given density. Contrast grade changed too. Negatives that required #3 filter now need a #2 filter.