Hi, In Photoshop --- I am trying to figure out how to get a "coffee cup ring stain" over a photograph.... So far, I have gotten the artwork (like an open-ended C shape) scanned in... marqueed it, and somehow after 2 days, figured out how to get it alone on a photoshop page..... The FIRST thing I need to do is change the color of this coffee mug ring stain from black to brown...For the life of me, I can't get the color changed to brown.... How to do? step by step. thank you!