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