I recently got an "older" book about 35mm rangefinders, which contained a section on the "plusses and minuses" of various film types. One of the advantages listed under negative film was the ability to produce either prints or positives. There was no explanation of how to create positives from a negative. Given the orange cast of negative film, it doesn't seem that copying a negative with negative film would get you anything worthwhile. Is anyone familiar with how to produce positives from negatives?