emissivity coefficients - ε -  (300K)

Quartz, Rough, Fused  :  0.93
Stainless Steel, sandblasted : 0.38
Stainless steel: type 18-8, sandblasted : 0.44
Stainless Steel, polished : 0.075
Aluminum Foil, shiny side : 0.03
Electroplated Gold : 0.03
Gold: plated on stainless steel and polished : 0.028