Sat Feb 04, 2012 8:18 pm
Thanks for joining us, and good luck with identifications! You might want to check out books on the history of photography, to learn about the history of paper and the look of photographic images. Just spending a lot of time looking at original photos, handling, and studying them is the best way to spot what is an original strike and what is a copy print. Unfortunately, there is no precise or consistent way to do this, because there are many ways that photos were printed. Original photos sometimes are totally blank; others have stamps or imprints; some have codes, which can be numbers or letters, some actually have titles printed on them. Original captions can be taped on the back, typed on the back, or even handwritten. Some originals have a great tonal range of black and white, some are toned, some are tinted, and some are sepia. There are prints from the teens that can still be as pristine as the day they were printed, while others are turning and the silver is becoming oxidized. Paper is a good way to differentiate between periods. Earlier base has paper that is thicker, firmer, matte, sometimes a little yellow, sometimes it's linen, rice paper, more artistic papers. later papers are resin coated, shiny, with almost a little plastic feel. Earlier images should be sharper since they were made from larger negatives. Most of the later prints are made from copy negatives. Early prints can be as small as 4x5s, or even a little smaller than 8x10, to large 11x14s, while a lot of the newer work is almost exclusively 8x10 or larger. Hope that helps.