On Thu, 27 Nov 2008 21:26:30 -0000, dennis@home wrote:

He could try a proper experiment..
take a box well insulated on all but one face.
Put in a 40w lamp.
put a sheet of metal on the remaining face
measure the temp in the box after it has stabilised.
See if there is any change in the temperature differences in each case.

But the paint by it self will make a difference so you need another metal
sheet painted but with out the magic additive.

--
Cheers
Dave.