In Paris in August 1839, the French government revealed a gift free of charge that would change the world forever. This gift was the daguerreotype process which had been invented by artist Louis Daguerre who used an iodine-sensitised silvered plate and mercury vapour to create some of the world’s earliest photographs and soon afterwards commercial photography was born. The trend of taking photographs spread quickly across the English Channel, but competition was fierce over the next several decades to develop new (...) methods of creating clearer images for less expense and with reduced exposure times. Victorian society embraced the technology of photography and much of the work conducted by family historians today revolves around identifying relatives in nineteenth and early twentieth century photographs. This article explores the history of portrait photography followed by an analysis of the ambrotype, tintype, cartes de visite and cartes postale found in the collection of the Moon/Prescott family from Lancashire which will provide a practical guide to dating and interpreting antique photographs. (shrink)