How do I change Font color with Adobe Reader in fillable form fields?

Allow Rich Text Formatting in the form text field and users can change the color of text.

Reader has no user interface for field properties but it can be done in Reader with a script.  You would have to create an interactive field or fields in Acrobat Pro first that changes the text color.  The command to change the text color is 

this.getField("TheFieldName").textColor= (a color from the color object);