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National Science and Media Museum blog

The biggest threat to the wellbeing of photographs is you! Most damage—especially to more fragile supports such as glass and paper—has occurred through human negligence or ignorance.

The New Chrysotype Process is so named in honour of Sir John Herschel who, in his classic paper of 1842 (1), first coined the term chrysotype to describe the photochemical production of an image in colloidal gold metal.