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