In article <46u8af$cr8@news.asu.edu>, weisguy@aztec.asu.eduø says...
>i think the stuff i'm thinking of is called dupatine/bad spelling >probably.. it's used by commercial production houses to cover windows >etc for filming.. (..)

A couple of layers of black "monk's cloth" (yuh, the stuff they used
to wear, I guess...), available at many cloth stores may work well.
Hope this helps.