well it is aluminum (about 0.020" thick, which is then coated with a harder, and no reactive material like nickel. the reason for this is aluminum being soft will start to tarnish as soon as you are done polishing it. whare as the nickel (being harder non reactive and much smaller grain size) can be highly polished to a brilian finnish and will not tarnish. the reflectivity of spectral aluminum is actualy a little higher than a mirror.
this is the same material spider lights and other reflectors are made out of.
Steve
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