[pure-silver] What is this old film?

At a camera sale last weekend I bought a box of 4x5 Kodak Direct Duplicating 
SO-015 film.  Can I use this film to make enlarged negatives?  Can it be used 
under a safelight, although the box says "only in total darkness."  Can it be 
developed in Dektol?  The film is dated Feb. 1975.  It may be useless, but it 
was cheap.

Janet Ness

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