Your suggestion is a nifty one, quick and easy.
But I did a bit of experiment because I think there should be something to do with the Normal template.

I go to the Normal.dotm in %APPDATA%\Microsoft\Templates
and
Go to Font
and
Change the All text Font Color to red
and
Save

When I open a new document or any other old documents, the font is red. But I don't know why

when I edit an old document (an exception), even if I attach the Normal template to the document, it is still the automatic black colour. If you are interested, please take a look at the attached documents.

In the zip files, you can change the template path in test.docx to the attached Normal.dotm path.

Thank you.

Attached Files

test.zip (55.1 KB, 10 views)