HELP ! Losing coolant, but no leaks?

Hey Mountain good to see you are still around. I forgot to mention the pressure test, when pumped up to 15 PSI it feel to around 10 or 11 PSI after about 10 or 15 min. I was told it is possible I did not have a good seal at the radiator. The overflow line (from the rad to the overflow container) was pinched off at the time of the test.

Still though if I am losing coolant with die in it would I not see it somewhere around the over flow if this was happening??