Many historical institutions have images in their collection that they use over and over again while other compelling images remain hidden.

Elizabeth Lessard explains the importance of an image index for original photographs and glass negatives so museums know all their options for interpretation instead of continuously handling the same images.

Lessard proposes cyanotypes of an organization’s original images as a safe alternative to Xerox copies for the creation of a visual index.

In this leaflet, she explains the process of creating cyanotypes, including what materials are necessary and where to obtain them.

Technical Leaflet #133 (1980)

For more information on similar topics, please refer to Technical Leaflet Bundle 14, Conservation: Some Basics.