When this happens it's known as de-silvering. This can occur from a variety of things like steam build up, moisture exposure or oils. It is very hard to avoid this from happening to your mirror, but don’t despair.
Rather than paying for a professional to re-silver your mirror, or worse buying a new mirror why not use Mirror Makeover mirror tape instead?
This marine quality tape was used on "Around the World" yachts & tested on mirrors in humid, wet shower & bathrooms by us for over four years.
Mirrormakeover is not only convenient & cost effective it’s a quick & easy to apply option that will cover those unsightly black edges for years to come. Suitable for bedrooms, bathrooms, shower rooms, caravans & yachts, in fact anywhere you need your mirror. Correctly applied it will last & last & last.
Mirrormakeover tape comes in two sizes 10mm & 15mm wide in a variety of finishes, mirrored silver, mirrored gold as standard but on special request almost any colour you want, including specially printed designs to match your own décor! You will need to contact us to discuss these though at sales@funkymonkeydesign.co.uk