How do I permanently add a new color?

[CountMountjoy]

I know how to define a new color for the current document (File→Properties→Colors) and save it to the palette so I can use it again in the same document, but how do I save it so I can use it in other documents?

[Woody44]

Open the "Normal" template, create your custom color(s), then save the template. If you will only need that color in certain docments, you can create a new template for use with the custom color(s).

Pages 163 and 566 of the user manual. (The English version.)