so what sort of solder do you suspect is used on a common radiator?

I know they are rohs now, so lead is out...is it mostly tin?

I searched wikki and see there are other options...would be interesting if there was one soldered with a high silver concentration.

http://en.m.wikipedia.org/wiki/Solde...edirected=true

I think I read somewhere that the typical folded fins is not ideal either. If the fins could be folded such that the fins formed rectangles instead of triangles, that you'd get some gain out of it...

I'm just happy to see some new ideas being tried, look forward to skinnees testing..