Materials and Techniques used for Retouch of Glass Plate NegativesHeld at the Golestan PalaceSahar Nohi

Variations of retouch on black and white glass plate negatives, including collodion and gelatin glass plates was a common practice in 19th and early 20th century. This paper, inspired by a larger research project, reports an examination of glass plate negatives held at Golestan Palace Photo Archive in Tehran to identify techniques and materials used. 

Method and Research Design: 

 Data is collected by observations, historical technical literature on retouching as well as from library materials.

Glass plate negatives are retouched by various tools and materials including graphite (pencil), abrasives (knife, needle or abrasive powders), colors, papers. Several techniques also have were applied as discussed in th epaaper.