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I just wanted to pass along a tip on how to sample a color form the original photo when applying a split tone affect to a grayscale photo.
First, go to View > Before and After to choose a before and after view that puts both the original color version of the photo along with the current grayscale version on screen together.
Next, click the color swatch for either highlights or shadows to open the color picker. Click and drag from the color picker out on to the color photo. Release the mouse to select the color you are sampling. You will see a live update as you move the cursor over the screen.