What is the difference between transparent translucent and opaque?

Transparent - see through, i.e. Clear Dura-Lar or Clear Acetate Translucent - allows light to pass through, but objects on other side are not clearly distinguished, i.e. Drafting Film and Vellum Opaque - not see through, light does not pass through, i.e.

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Translucent panels are light transmitting. OPAQUE panels are non light transmitting. However, no fiberglass panel should be considered to be light excluding (such as for darkrooms) as glass fibers always have the potential of allowing small amounts of light through.

Opaque FRP panels may contain specific fillers to insure low light transmission. More.

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