[Fixittt]

Ok, I dont buy into that.

I have a copper block, Prolly the same alluminum res, and a copper heatercore. Aluminum doesnot that I know of) addmit a color green. Copper does. If you need proof of this, then I can take pics of my copper chip pile soaking in some coolant from machining. the Coolant is all green. its a reaction from the tarf the copper. Ever look at a church that has that Big green Steepel, or Dome. That is copper. the rain is what makes it change color.

As far as the water turning color so fast, My guess is that some copper component had been filled with water, then drained, but not completely, and was left sitting for a while. Prolly the Rad.

I Run rather high mix of WW in my system, And the mix has stayed a nice ink color for over 6 months now.