True mirror desilvering cannot be polished away from the front of the glass. Black edges or dark patches can develop when the reflective backing deteriorates. Your practical choices are professional resilvering, hiding a small damaged edge with a suitable frame, or replacing the mirror. The right choice depends on the mirror’s value and how much of the reflection is affected.
Start by checking that the mark is not simply surface residue. Gently clean the glass with a soft cloth, following the mirror’s care instructions. If the dark patch remains behind the glass, scrubbing harder will not restore the missing reflection.
Why the edges can turn black
Moisture or cleaner reaching the backing can contribute to corrosion, especially around vulnerable edges. Damage to the protective backing can also expose the reflective layer. A surface scratch and a deteriorated reflective coating are different problems, even when both affect the view.
Preventing liquid from collecting at the edges is more useful than repeatedly treating the visible black patch. Read how to keep a bathroom mirror clean for an everyday routine that avoids flooding the edges.
Repair, conceal or replace?
- Keep a valuable or sentimental mirror: ask a specialist about resilvering and whether the glass is suitable for restoration.
- A small edge defect: a suitably fitted frame may hide the affected border, but it will not rebuild the silver layer or stop an underlying moisture problem.
- Large or spreading patches: replacement may give a cleaner result and a chance to improve the size, shape or lighting.
- A newer purchase: contact the seller with photos and order details before arranging restoration or removal.
Resilvering is a process applied to the back of prepared glass, not a touch-up painted onto the front. Wilson Glass explains the restoration and replacement choices for mirror rot. A generic silver paint or clear acrylic spray is not a reliable way to recreate an undamaged mirror coating.
For an LED mirror, do not strip the backing, remove electronics or spray treatments around the lighting and controls. Contact the supplier first so the mirror’s construction and repair options can be assessed.
If replacing it, make the new mirror an upgrade
Think about the improvement you want beyond removing the black edge. A more useful size, light towards your face or a softer shape can make the bathroom feel refreshed without changing the whole vanity. These in-stock options offer three different looks.
80 × 60 cm gold frontlit mirror — £159. A defined gold frame creates a warm focal point, with front lighting, dimming, three light colours and anti-fog. Choose it when a decorative outline and useful grooming light matter most.
60 cm round dual-light mirror — £128. A circular outline softens the room while front and rear lighting combine a practical reflection with a wall glow. Dimming and anti-fog support the everyday routine.
50 × 80 cm long oval backlit mirror — £99. The elongated curve and rear halo offer a softer look. Three light colours, memory, dimming and anti-fog make it an attractive choice when you already have good supporting face lighting.
Prices and stock checked on 27 October 2026. Listed prices are before any checkout promotion.
Help the replacement keep its finish
Use a soft cloth and the recommended cleaner, applying it to the cloth rather than spraying the edges. Wipe away moisture that collects around the mirror and keep bathroom ventilation working well. Avoid abrasive pads and unapproved chemical treatments on the glass or frame.
Anti-fog heating helps clear the heated reflection area; it does not make every edge immune to moisture or replace room ventilation. Choose a mirror suited to a bathroom and follow its installation and care instructions.
If the mark is on a metal frame rather than behind the glass, our guide to rust marks around bathroom mirrors covers a different problem. For a change of outline, explore bathroom mirror shape ideas.
Desilvering questions
Will glass cleaner remove black spots behind the mirror?
No. Cleaner can remove surface dirt, but it cannot replace a damaged reflective coating behind the glass.
Does fitting a frame repair the mirror?
A frame can conceal a narrow damaged edge if the fitting is suitable. It is a cosmetic solution, not resilvering, and any moisture issue still needs attention.
Ready for a fresher reflection? Browse LED bathroom mirrors from LED Mirror World and choose a size and lighting style that makes the upgrade worthwhile.