Starmer Said Diane Abbot Can Run...
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No best answer has yet been selected by MargeB. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Marge it's called photo tinting. It was done with special inks (which you can still purchase at some craft/art shops). However the effect is now done digitally. Here are examples:
http://www.fostergraphics.com/phototinting.htm
Google also has info about doing it yourself.