I just found this website where you can download a free trial version of some really cool software which makes it east to add colour to black and white photos.
Its really useful for me as I like to use vintage images and portraits in my altered art and collage projects. However I'm always drawn to those which were hand tinted as that touch of colour really makes a difference.
I'm not very skilled with digital imaging and not patient enough to teach myself properly however in just a few minutes I managed to turn this
Into this - ok its not perfect but not bad for a first go.