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Over the next few weeks, I’ll be showing you how to date your old family photographs by format and process, using the photographic techniques that dominated the first 100 years of commercial photography.Frustratingly, old family photographs often come without any accompanying documentation so it can be very difficult to identify their age.Following the theoretical insights of Dean (1978), this paper sets forth principles and procedures for relating radiocarbon dates to cultural events.Emphasis is placed on identifying and taking into account the formation processes of (1) the dated specimens and (2) the deposits that yielded them.Carbon-14 cannot be used to date biological artifacts of organisms that did not get their carbon dioxide from the air.This rules out carbon dating for most aquatic organisms, because they often obtain at least some of their carbon from dissolved carbonate rock.Carbon dating is used to determine the age of biological artifacts up to 50,000 years old.

With just a basic knowledge of what these physical clues can tell you, you are well on your way to revealing the mysteries of your family photographs and their subjects.All around us we see gorgeous people, on television, in movies and magazines.We see ugly people too, but they're not the main actors.Before so-called radiometric dating, Earth's age was anybody's guess.Our planet was pegged at a youthful few thousand years old by Bible readers (by counting all the "begats" since Adam) as late as the end of the 19th century, with physicist Lord Kelvin providing another nascent estimate of 100 million years.