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A welder's mask is much too dark to play a game with.

There are, however, IR cut-off filters. They're used in photography. See: http://en.wikipedia.org/wiki/Infrared_cut-off_filter



There are also sunglasses that filter out IR only, we wear them in the laser labs in school all the time.


An oxyacetylene welding mask would probably work, since they are less opaque than an arc welding mask.




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