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Frequently Asked Questions
How is a mirror made?
A reflective coating on one face of float glass.
Silver, in almost all modern mirrors.
Protective paint or lacquer goes over it.
The reflective surface is on the back.
You see it through the glass.
What is black edge?
Corrosion of the silver from the edge inward.
Moisture creeps under the backing.
A dark fringe spreads slowly.
The centre often stays perfect.
It cannot be polished out.
Why are bathrooms the worst case?
Because moisture reaches the edges constantly.
Steam condenses and runs down.
It sits at the bottom rim.
Ordinary backing is not made for that.
Wet-area mirrors use resistant backings.
Can adhesives damage a mirror?
Yes, and it is a common cause.
Acid-cure silicones are the usual culprit.
They attack the backing chemically.
Blotches appear where the adhesive sat.
Use only mirror-safe products.
How should a mirror be cleaned?
Spray the cloth, not the mirror.
Liquid sprayed on runs to the edges.
That is exactly where damage starts.
Wipe the edges dry afterwards.
Avoid harsh or abrasive cleaners.
Which fixing method is better?
Clips and channels hold it mechanically.
They also let the back breathe.
Adhesive fixing looks neater.
But it is permanent and product-sensitive.
A ventilated gap helps in damp rooms.
What is safety backing?
A film applied to the rear face.
It retains fragments if the mirror breaks.
Public buildings and gyms require it.
So do schools and changing rooms.
Toughened and laminated substrates also exist.