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