This type of image is called a sun print and is a digital version of 19th century technique where objects were placed on treated paper and left in the sun.
I used this black and white image.
In Photoshop I added a layer to the image (Layer-New fill layer-Solid Colour). The colour picker window then popped up. I chose a warm yellow colour and clicked OK. The whole image was covered with a yellow mask.
In the layers dialogue box I changed the opacity of this mask layer to around 70% and altered the blend mode to Colour Burn. I flattened the image then selected the Levels tool (Image-Adjust_ Levels)altered the brightness and the amount of black in the image. I then cropped the image.
My response to Cee’s Fun Foto Challenge: Colourful Monotone