I noticed that the extending part of the Verdilac whip as well as the weapons special projectile attack do not get a custom energy color applied. Instead they always stay orange. See this reference image, where I colored everything (including the secondary energy channel that becomes available later) in a bright green:
For a moment I considered that this might be intentional, but then I discovered this:
1.: If I hover another color on the secondary energy channel, the color changes, but only in the preview, it does not get applied:
2.: Other Archon weapons do not have this property, see Nepheri: