I have a small a box of late Victorian / Edwardian glass negatives and positives, and in amongst them are 13 colour positive glass slides. One is clearly an Autochrome, but the other twelve are made with a process that I am unfamiliar with.
At first glance they appear to be similar to ones attributed to the Finlay Colour Process, but looking under a loupe the 'grid' and colour patterns appear to my untrained eye to be rather different. They comprise of perfect squares (with very crisp edges) in a diagonal grid and I think are only made up of alternating magenta and green (or thereabouts). There are about three squares per millimetre, so c. 72 dpi.
I haven't got the correct equipment to get a good image, but you can get a rough idea from a detailed crop I have put online at http://www.flickr.com/photos/whatsthatpicture/4930188331/ (and see the full image linked from that).
I would welcome any suggestions as to what process this might be.
Regards, James
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