This International Standard specifies a method for measuring densities of first generation silver-gelatin microforms.
It specifies density values for different qualities of documents.
It applies to source document negative-appearing microforms.
It does not apply to microforms for technical drawings which are dealt with in ISO 3272-2, or to diazo and vesicular
films which are the subject of ISO 8126, or to COM microforms which are dealt with in ISO 8514.