Table tops and mirrors · Bengaluru and Delhi NCR
Mirror Turning Black at the Edges? Causes & Repair Cost
Black edges are damage to the mirror's silver backing, and they cannot be cleaned away or reversed.
₹416/ sq ft starting price₹52020% off
The starting price for Mirror & Custom Glass Installation, the commonest fix. You pay this rate for the square feet we measure on site.
- Verified on-site measurement
- 2-year product warranty, 6 months on the work
- Fitted by our own team. We never subcontract.
- mirror black edges
- bathroom mirror black spots
The short answer
A mirror turns black at the edges when moisture reaches its silver backing. Steam, splashes and sprayed cleaner get in where the edges were left unsealed. The damage cannot be repaired, so the fix is a new mirror. For damp rooms we suggest copper-free mirror with sealed edges, which resists this spotting.
The useful distinction
The damage pattern shows where moisture entered
Blackening rising from the bottom edge usually follows splashes or sprayed cleaner. Spots spreading from several edges point to steam and unsealed glass. A patch growing from the centre can mean damp or unsuitable adhesive behind the mirror.
Why it happens
Usually one of these 4 things, commonest first. Each one says how to tell, and what we do about it.
Steam has reached the backing at the edges
- How to tell
- Black or dark grey marks start at the edges and corners, then creep inward. The mirror hangs in a bathroom or close to a shower. The front of the glass is clean and smooth.
- What we do
- We make a new mirror to size in copper-free mirror glass, which resists damp better. We seal its edges before it goes up.
Mirror & Custom Glass InstallationFrom ₹416 / sq ftSee this fixCleaner has soaked in along the bottom edge
- How to tell
- The marks are worst along the bottom, where sprayed cleaner runs down and sits. You may see dark streaks rising from the lower edge.
- What we do
- Your new mirror gets sealed edges, so liquid cannot creep behind the glass. Spray cleaner onto a cloth, not straight onto the mirror.
Mirror & Custom Glass InstallationFrom ₹416 / sq ftSee this fixGlue behind the mirror has spoiled the backing
- How to tell
- Dark patches show in the middle, in spots or lines, not only at the edges. They often match where glue was put on the back.
- What we do
- We fix the new mirror with neutral-cure silicone, which does not eat into mirror backing. Where the wall suits them, clips or brackets carry the weight instead.
Mirror & Custom Glass InstallationFrom ₹416 / sq ftSee this fixDamp is coming through the wall behind
- How to tell
- The black spreads from where the mirror sits against the wall. The wall beside the mirror feels damp or shows marks. A new mirror on a wet wall will spoil the same way.
- What we do
- Curing damp in a wall is not work we do. A waterproofing contractor or a mason deals with that. Once the wall is dry, we fit a new mirror with sealed edges.
Mirror & Custom Glass InstallationFrom ₹416 / sq ftSee this fix
What you can check first
These checks are safe to do yourself. A photo or a short video of what you find helps us come prepared.
- Look where the black starts: all the edges, the bottom edge, or spots in the middle.
- Wipe a mark gently with a dry cloth, because damage to the backing will not wipe off.
- Check the wall beside the mirror for damp marks or peeling.
- Think about your cleaner, and whether it is sprayed straight onto the glass.
What the repair costs
Every fix on this page, with its starting price before GST. We find which one you need, and you get a fixed price before any work starts.
| Fix | Starting price | How it is priced | Link |
|---|---|---|---|
| Mirror & Custom Glass Installation | ₹416/ sq ft | You pay this rate for the square feet we measure on site. | See this fix |
Not sure which one it is? Send a photo or a short video. We will tell you what it looks like, usually within minutes, before anyone comes out.
Chat on WhatsAppA photo or a video is enough to startCommon questions
Can the black edges on a mirror be cleaned off or covered up?
No. The marks are behind the glass, in the silver backing itself. Cleaning the front cannot reach them. Anything put on the back will not bring the reflection back either.
Is a mirror with black edges unsafe to keep?
No. The damage is to the reflective coating, not the strength of the glass. It only looks worse as it spreads inward. You can keep using the mirror until the new one is fitted.
Can my new mirror be the same size and shape as the old one?
Yes. We measure the space on site and make the new mirror to those sizes. You can also change the size or the edge finish at the same time. A bevelled edge, which is cut at an angle, costs more than a polished one.
Is copper-free mirror only worth it in a bathroom?
It suits any damp spot, such as a bathroom, a kitchen or beside a washbasin. In a dry room, ordinary mirror usually lasts well. We suggest the type that suits where your mirror will hang.
Related problems
Other problems with the same kind of door, window or fitting, and where to go next.
Table tops and mirrors
Same fixes, other problems
Get it fixed at your place
We come to you anywhere in Bengaluru and Delhi NCR. We find the cause, and give you a fixed price before any work starts.
- Toughened safety glass, at the thickness stated in your written quote.
- The fittings, finish and supplied parts are named before you approve the job.
- We source the glass and fittings against the specification in your written quote.
- We check the quality before we leave. Most jobs are done in 3 to 4 days.
- No hidden fees. GST is shown as its own line on the quote.
- Your details stay protected and confidential on a secure connection.
- You get dedicated support after fitting, from the same team every time. They are dependable.
- Easy and transparent from the first message. We work customer-first, so the job stays hassle-free.
