How was color first added in or blended into black & white photos?

Usually the old B&W photos were hand tinted using transparent oil paints. Often, if the photographer knew he was going to tint the photo he would print it slightly underexposed to allow the tints to be more vibrant.

In adobe photoshop... you have two layers ... one in full colour at the back and a black and white version on top... then you can cut out the lips and dress on the top layer and you'll be able to see the colours from the layer at the back. If you only have a black and white picture then it's more difficult to get crisp colours but you can still get some colour on them. There is also a hub in the right side of this page "How to make photos black and white with a splash of colour".

Well, most of these pictures have been taken in color. Later, I have edited them and added black & white to the background. The main subject of the image has been focused on, with the help of color.

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