BS ISO 8126:2000

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement of density
    4.1 Method of measurement of silver-gelatin
          and diazo duplicates
    4.2 Method of measurement of vesicular
          duplicates
    4.3 Measurement areas
          4.3.1 Sampling aperture
          4.3.2 Use of density patches
5 Visual diffuse transmission density of duplicate
    microforms from source documents and COM
    5.1 Silver-gelatin duplicates
          5.1.1 Positive-appearing duplicates
          5.1.2 Negative-appearing duplicates
          5.1.3 Direct positive duplicates
    5.2 Diazo duplicates
6 Projection density of vesicular duplicates
    6.1 Vesicular duplicates of source document
          microforms
          6.1.1 Positive-appearing vesicular duplicates
                  of source document microforms
          6.1.2 Negative-appearing vesicular duplicates
                  of source document microforms
    6.2 Vesicular duplicates of COM microforms

Defines visual diffuse transmission densities for second generation silver-gelatin and diazo microforms and projection densities for second generation vesicular microforms. In addition it defines measurement procedures. Not applicable to duplicates of microforms of technical drawings and other drawing office documents.