From the first few i've seen floating around who use only one type of feed, the colour thats meant to darken or lighten actually stays the same and the other colours move. The RGB figures have been rounded by up or down.

Desert Yellow (220,180,90) ----> 1 O'Ghomoro Berries -----> Aldgoat Brown (160,135,90) [-60,-40,=]

Desert Yellow (220,180,90) ----> 2 Xelphatol Apples -----> Millicorn Yellow (220,160,50) [=,-20,-40]


This indicates that by darkening blue you are infact removing hue from red and green the one 2 steps away dropping double the one closest.

This was a very shallow test and is in no way fact.