color mixing

I want to know how you can mix colors in PS6.
I have sampled 2colors from an image one greyish and other earth color .I want to mix these 2 colors so that with the result color I can paint on a new layer?

There are a few ways to go about this. The first and easiest is this.
Take each color and fill a layer with it. (The layers should be one on top of another.) Then, set the top layer to mutiply and use the eyedropper tool to sample your color. This should be a mix of your two starting colors.

The second way is to create a new document in duotone mode.
To do that, make a new document and set it to grayscale. Then, select Image>Mode>Duotone. A pop up should result. In the dropdown at the top, once again select duotone. Now, the squares down the left are for the colors that you want to mix. If you double click on a blank square the color picker should open allowing you to set each one. (If you get a list of Pantone colors, click the picker button on the right to enter your own values.)

Once you have your two colors, close the dialogue box and return to your new document. Basically you can now draw (with any color you want) and it will automatically convert to a shade of the blend you created.

thanks a lot!! for me the second option worked the best i sampled from the image plus I had tritone option , where I went crazy!!!!!!!!!!!!!!!!!!
thanks