Expose the image onto the paper as you normally would - with the help of a test strip of course. Take some developer and apply it on the photo paper with a brush, fingers, etc. You can use a red light filter if you want to be percise. Wash it, stop it, fix it as you usually would.
Strengths: No matter what I did to it, the picture would look pretty cool.
Weakness: Sometimes nothing showed up when I put developer on it. Sometimes areas would be darker than others.
