Typically, watercolours, oils, crayons or pastels, and other paints or dyes are applied to the image surface using brushes, fingers, cotton swabs or airbrushes. Hand-coloured photographs were most popular in the mid- to late-19th century before the invention of colour photography and some firms specialized in producing hand-coloured photographs.
Some of interesting hand-colouring photos below will help us more understanding.
|Red Umbrella by holgagirl|
|Pink by kismekate|
|Rose by E. A. Smith|
|Daises? I think these are Daises by elise shively photography|
|Tawawa Park Leaf by bmcmaster|
|do the hustle by The Cassandra Project|
|Crossroads II by Hollis Johnson|
|Primaveira en Covelo II /Spring in Covelo II by Roberto Carbajo Nogueira|
|taos truck revisited by paddyjoe|
|Taste the Rainbow by Christine ™|
|hand colored flower by redrock flyer|
|Huts by sixbysixtasy|