Is coolant supposed to get darker??

[dell30rb]

My cr80's coolant is dark, and you cant see through it. The first time I opened the radiator cap, (after a few rides) I looked in and the coolant was dark, dark green, and I couldnt see the little holes where the coolant goes through (from the top of the radiator to the bottom). I recently replaced the coolant with pro honda 50/50 mix, and the coolant was almost clear, but slightly green. After a few rides i checked it, and it was darker, but i could still see through it. I checked it again today, and it is completely opaque with a forest green color.

Whats up? is it normal for coolant to change color after it gets whipped by the pump? Do I have a leak of some sort? It never looses coolant either.

 

[Durt Cycler]

I think this this normal. when I replaced my coolant with Maxima coolant it was clear, then after riding I checked my coolant level and noticed it became slightly darker.