I hope I'm in the correct forum now for asking a question about color. What Ed said about grayscale converting is interesting, but I don't know what it means. So, I ask the following questions and ask if they are in any way related:

My questions today would be - is there an easy way to get sepia back into a picture if you turn it from color to grayscale to work on it – or to just get sepia period, or is that what you are doing in channels? And, I'm having trouble with colors (in Image adjust color). Like in the black skin tones I can't get the brown I need out of the color adjustments. It's like the reds that get into aging pictures I can tone those down, but once again can’t find browns. Kids stuff?

There are many, many ways to do various tones, including sepia toning. Here are some of the simplest:

Hue/Saturation adjustment layer...turn 'colorize' on...move hue slider control back and forth until you get the tone you want...move the saturation back and forth until you get the saturation you want...move the brightness...well, you know the rest

There's a sepia toning action that ships standard with Photoshop...you might have to use 'load actions' if you don't already have it loaded

Make a new layer, fill it with your favorite sepia color...switch blend mode to color...play with opacity

Let's hear some other favorite sepia toning techiques, guys. Especially if someone has a duo-tone technique.