I was speaking to the director of our turfgrass program at the CDGA, Ed Nangle, about this topic. Before he came to us he did some research regarding pigmentation and published some interesting work with colleagues. Too technical for this lawyer but I will get and forward the citations. In any event, he suggests that there are several potential benefits to this procedure. First, the darker color tends to hold heat. When the course comes out of dormancy this is likely to speed recovery from the winter. Second, if overseeding is used, the rye or other grasses need a lot of water when germinating. Accordingly the course will play a lot softer for extended periods. It will probably play softer throughout the winter. Third, if a course is overseeded, when the warm weather comes, it takes some time for the rye to die off. During that period, the rye competes with the bermuda for water, nutrients etc. and slows the recovery. Finally, if "green" is desired, its a lot cheaper to apply pigment as opposed to the cost of overseeding. So if green is desirable, this is not such a strange idea.