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| Sun Printing |
| Frontline units occasionally used a "Blueprinting" process to create extra copies of trench maps. They placed a map drawn on tracing paper over a sheet of light sensitive paper and allowed the ultraviolet rays of the sun to do the rest. On a clear day a "Sun Print" could be made in less than half an hour but if the weather was overcast it could take several days to generate as few as a dozen copies. |
| The image below was taken from a "Sun Print" in our collection (ID #199ww1map). |
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Contact: mapref@mcmaster.ca