Font Question

Hi all -

I want to have the editor do the following: When the editor window opens with whatever content is in it, I want that content to remain the default color - black.

As soon as someone starts to type in the editor, I want that font to appear as red. Imagine Word's "Track Change" function if you will.

I know how to change the default color - but that makes all text change - not what I am looking for.

Thanks!