Codex Argentus is a sixth-century Gothic MSS. It is unique in that the vellum(?) is purple, and the lettering is silver and gold.

There's a facsimile online. There are a few pages representative of the actual color of the MSS; but the facsimile edition has its contrast such that the letters can actually be read ... well, if you know Gothic.

Kudos to Hypotyposes for the link to the Codex Argentus page at Uppsala University.

While we're on the topic of Gothic, my colleague Eli Evans has designed a Gothic font called Gotisch (bottom of the page). If you're at all interested in Gothic you may be interested in the font.