Most people judge a mirror by its frame. The part that determines whether it still looks good in ten years is the part nobody examines: the reflective coating on the back, how that coating is sealed, and how the edges are finished. Almost every mirror problem we encounter, from black creeping in at the corners to a slightly yellow cast across the reflection, originates in those three things.
This guide explains how mirror glass is actually made, what a bevel does beyond decoration, how antiqued and foxed finishes are produced, and how to read quality when you cannot see the back of the panel. The aim is to let a buyer assess a mirror the way a glazier would.
Modern mirrors start as float glass, the flat glass produced by floating molten glass on molten tin, which gives the extremely flat parallel surfaces a good reflection requires. The rear face is then chemically coated with a thin layer of silver, followed by a protective layer and one or more paint layers that seal the metal against air and moisture.
That stack is the whole story of mirror durability. Silver is an excellent reflector and a poor survivor: exposed to moisture it oxidises and the mirror develops the dark spotting and creeping edge damage that people describe as the mirror going black. The paint backing exists to prevent that. Thicker, better applied backing lasts longer, and mirrors specified for damp environments use backing systems formulated for it.
Aluminium coated mirrors also exist. Aluminium is more corrosion resistant than silver but reflects slightly less light and gives a marginally cooler, duller reflection. It appears more often in budget and industrial applications than in decorative interiors.
Thickness matters for flatness rather than for reflectivity. Thin glass flexes, and a flexed mirror distorts the reflection in a way that is immediately noticeable on a full length panel. This is why larger mirrors use thicker glass, and why a large mirror that feels light should be treated with suspicion. Across our wall mirrors UK range, panel thickness rises with panel size for exactly this reason.
An unfinished cut edge on glass is rough, contains micro fractures and offers moisture a direct route to the silvering. Edge finishing addresses both problems. A ground edge removes the roughness. A polished edge takes it further, producing a smooth clear border. A bevel goes further still, grinding a wide angled face around the perimeter and polishing it to optical clarity.
The decorative effect of a bevel is well known: the angled face refracts light and throws a faint prismatic line around the mirror, which gives depth and reads as traditional craftsmanship. The structural effect is less discussed. By removing the fragile arris and creating a thicker, better supported perimeter, a bevel makes the most vulnerable part of the panel more robust and easier to seal.
Bevel width is a design decision. A narrow bevel is subtle and suits contemporary rooms. A wide bevel is emphatically decorative and reads as period. Both cost more than a flat polished edge because bevelling is a separate grinding and polishing operation, and a wide bevel removes a lot of glass.
Frameless mirrors depend entirely on edge quality, since there is no frame to hide or protect the perimeter. If you are buying frameless, the edge is the specification to check, and pieces in our decorative mirrors UK selection make that edge treatment part of the design rather than an afterthought.
Antique mirror, sometimes called foxed mirror, imitates the appearance of old glass whose silvering has degraded unevenly. It is produced deliberately, by chemically distressing the backing or by applying it unevenly, then sealing the result so it remains stable. The mottling is permanent and controlled, which is the key difference between antiqued mirror and a mirror that is genuinely failing.
The practical consequence is that antiqued mirror reflects less and diffuses more. It is a decorative surface rather than a functional one, and it is the wrong choice for the only mirror in a bathroom or for a dressing mirror. It is an excellent choice for a large wall panel where a fully reflective surface would be overwhelming, because it adds light and depth without doubling the room.
Tinted mirrors work differently again: the glass itself is coloured, usually bronze, grey or smoke, before silvering. The reflection is darker and warmer or cooler depending on the tint. Smoked mirror has become common in contemporary British interiors precisely because it softens the reflective effect in rooms where a clear mirror would feel stark. Mirrored furniture uses these finishes heavily, and mirrored bedroom furniture UK often combines clear, bevelled and tinted panels on a single piece.
There are checks anyone can make. Look along the reflection at a shallow angle: a distorted or wavy reflection indicates a panel that is not flat, either from thin glass or poor mounting. Look at a white object in the reflection and compare it with the object itself: a green tinge indicates standard float glass with a higher iron content, while low iron glass returns a more neutral white.
Examine the edges closely, particularly the corners. Chips, rough arrises or backing paint that stops short of the edge all indicate a panel that will admit moisture sooner. On a framed mirror, check whether the frame allows the glass to breathe or traps it against a solid damp backing board.
Ask about safety backing. A polyester safety film applied behind the mirror holds fragments in place if the panel is broken. For full length mirrors, cheval mirrors, bathroom mirrors and anything in a child’s room, this is a specification worth insisting on rather than a luxury.
The table below compares the main mirror glass specifications on appearance, durability and appropriate use. These are manufacturing specifications rather than statistics.
| Specification | Appearance | Durability consideration | Best used for |
|---|---|---|---|
| Silvered float glass | Bright, accurate reflection, faint green cast | Backing quality decides lifespan | General interior mirrors |
| Low iron glass | Neutral, true colour reflection | Same backing considerations, higher cost | Dressing mirrors and colour critical use |
| Bevelled edge | Prismatic border, added depth | Stronger, better protected perimeter | Frameless and statement mirrors |
| Antiqued or foxed | Mottled, diffused, low reflectivity | Stable once sealed, not a fault | Decorative wall panels and splashes of texture |
| Tinted or smoked | Darker, softened reflection | As float glass, tint is in the glass itself | Mirrored furniture and large panels |
| Safety backed | Identical to standard | Holds fragments if broken | Full length, bathroom and children’s rooms |
In bathrooms, specify for moisture rather than for looks alone. Damp resistant backing, well sealed edges and a mounting that leaves an air gap behind the panel will add years. Never mount a mirror directly against a cold wet wall surface without ventilation behind it, because trapped condensation attacks the backing from the rear.
Clean carefully and clean the right way. Spray cleaner onto a cloth rather than onto the mirror, because liquid running down the face collects at the bottom edge and sits against the backing. That lower edge is where black spotting appears first, and it is almost always a cleaning habit rather than a manufacturing fault.
Mount securely and appropriately for the wall. Large mirrors are heavy, and plasterboard requires proper fixings rather than standard plugs. A leaning full length mirror in a home with children or pets should be restrained to the wall regardless of how stable it appears.
Place mirrors to reflect something worth reflecting. The most useful position is usually opposite or adjacent to a window, where the mirror returns daylight into the room. Placing a mirror opposite a cluttered wall simply doubles the clutter, which is the most common placement error in small British rooms.
Think about scale honestly. In a narrow hallway, one large mirror opens the space while several small ones fragment it. Cheval and full length mirrors need floor space and a clear view back, so measure the standing distance as well as the wall.
This 2026 guide was compiled by our editorial team as a UK furniture retailer, drawing on established mirror manufacturing processes including float glass production, silvering and protective backing, standard edge finishing and bevelling methods, and the material properties of tinted, low iron and safety backed glass. It contains no proprietary sales data, no pricing data and no survey fieldwork, and no statistical claims are made about the mirror market.
Journalists and websites are welcome to cite this 2026 guide, crediting Furniture in Fashion as the publisher and linking back to this page. The guide describes mirror glass manufacturing and specification and does not present market measurement or laboratory test results.
Moisture has reached the silvered backing, usually through the edge of the panel. It is most common in bathrooms and is often accelerated by cleaning spray running down the glass and collecting at the bottom edge. Once the coating has corroded it cannot be repaired.
A bevel refracts light around the perimeter, giving depth and a traditional finish, and it also removes the fragile sharp edge of the glass, leaving a more robust and more easily sealed border. It is a structural improvement as well as a decorative one.
No. Antiqued or foxed mirror is produced deliberately by distressing the backing and then sealing it, so the mottled effect is stable. It reflects less than a clear mirror, which makes it decorative rather than functional.
Larger mirrors need thicker glass to stay flat, since flexing distorts the reflection. Thickness affects flatness and weight rather than how well the mirror reflects, so treat a large panel that feels unusually light with caution.
For full length mirrors, bathroom mirrors and anything in a child’s room, yes. A safety film behind the panel holds the fragments together if the glass breaks, which is the difference between a contained accident and loose shards.
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