Digital BW, The Print

There are parts of the color theory and descriptions of the operation 
of the retina that do not hold in modern science. EX. "Recall that 
blue light+ yellow light = white light." This is absolutely wrong. 
Try it and find out, go to any stage, and put a yellow gel on a 
light, and a blue gel on another. Then aim the lights so that they 
mix, you will not get white. They may want to do some more research 
on color theory by going through the tutorials at 
http://www.measureitrite.com/ . They are free. They should go through 
atleast the color theory module, and really they need to pick up a 
couple of modern books on color theory and how it works with the eye 
and on prints (additive and subtractive).