{HEAD ~ A preferable metal foil} is of aluminum or stainless steel in a thickness of 10 to 20 μm having {TAIL ~ a total reflection rate} of 80% or more, against a tungsten lamp 
{ HEAD ~ A preferable metal foil } is of aluminum or stainless steel in a thickness of 10 to 20 μm having { TAIL ~ a total reflection rate } of 80 % or more , against a tungsten lamp
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH