Start with a black-and-white image in RGB mode (if you don't have one handy, create one using the solution, "Converting Images to Black-and-white"). The image doesn't need to be flattened; you can keep any adjustment layers you may have used to create your black-and-white image.
Click on the Create new fill or adjustment layer button at the bottom of the Layers palette, and select Hue/Saturation, from the menu that appears.
In the Hue/Saturation dialog box, tick the Colorize checkbox, and move the Hue slider to your desired color level. Adjust the Saturation value to your liking. As you can see in the example shown here, I've set the Hue for my image to 38, and the Saturation to 20. When you're done, click OK.
The end result is a lovely, sepia-toned image, and since we've produced it using an adjustment layer, our original image remains untouched. Oh, the beauty of it all!
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