Somebody has put a corrosive gel on the glass and left it to work. What you are looking at now is a pale, clouded shape burned into the surface, and it will not come off with anything. Not a cleaner, not a solvent, not a blade. The blade will only add scratches on top.
The damage is acid etched graffiti. The acid has dissolved the surface of the pane, leaving microscopic pitting that scatters light instead of letting it through. That is why the mark looks white rather than coloured, and why there is nothing sitting on the glass to be removed.
Restoration takes the damage out of the pane in place. Same day in most cases, no boarding, no replacement unit to order, and a small proportion of what a glazier would charge you.
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The Working Day Here Runs Backwards
Every other district we cover has a dead hour somewhere in the small hours. Farringdon does not, and any contractor who assumes otherwise has not worked around Smithfield.
The market trades through the night. Vehicles arrive from the early hours, the streets around Charterhouse Street and West Smithfield are busy with loading and porterage while the rest of London sleeps, and the trade winds down mid morning rather than starting then. The bars and restaurants that serve that trade keep hours to match.
Layer the rest of the district on top and the pattern gets stranger. The offices and studios along Clerkenwell Road, St John Street and Turnmill Street fill from eight and empty by seven. The Elizabeth line and Thameslink interchange pushes commuter volume through the station approaches twice a day. Leather Lane runs a weekday lunch market. Exmouth Market fills at lunchtime and again in the evening.
The consequence is that there is no single Farringdon window, and the right one is often counterintuitive. Around Smithfield, mid afternoon is the genuinely quiet period, because the market has finished and the evening trade has not begun. On the office streets, early morning still works. On the market streets it emphatically does not.
We establish which of those applies to your frontage before quoting rather than proposing a standard slot and discovering the problem on the day.
Recent Acid Etched Graffiti Removal Projects
Hatton Garden: The Insurer Has A View On Your Glass
The jewellery quarter sits immediately west of the station, and premises there carry a complication nobody else in the district has.
Glazing at a jeweller is rarely just glazing. It is frequently laminated and attack resistant to a specification, and that specification commonly exists because an insurer required it as a condition of cover for the stock behind it. The glass is part of the security arrangement, not merely part of the building.
That produces a question no other trade asks us: after the work, is the glazing still what the policy requires?
The answer, for restoration, is yes, and the reasoning is simple. The unit is never removed. Its construction, its interlayer and its rating are untouched, because all that happens is that an extremely thin layer is taken off the outer surface and polished back. Nothing about the pane's performance as a security element changes.
Replacement is where the risk sits. A new unit has to match the original specification exactly, and a like for like substitution that is not genuinely like for like is the sort of thing that surfaces at the worst possible moment.
What a jeweller actually needs from us, therefore, is not just clean glass but a written record: what the pane was, what was done to it, and confirmation that the unit was not removed or altered. That is issued as standard on this kind of job, alongside the dated photographs, so it can go straight to a broker if asked for.
Where We Get Called Out Around Farringdon
Cowcross Street and the station approaches. Bars, cafes and retail serving both the market and the commuter flow, with the heaviest exposure in the district and frontages busy at almost every hour.
Charterhouse Street and West Smithfield. Market premises, trade suppliers and the bars serving them, on streets that are at their busiest when everywhere else is empty.
Clerkenwell Road and St John Street. Design studios, showrooms and creative offices in converted warehouse stock, usually with large single pane glazing set into older openings.
Hatton Garden and Greville Street. The jewellery quarter, with the specified and rated glazing described above, plus security grilles and shutters that complicate replacement further.
Leather Lane. Weekday market trading in front of fixed premises, so access has to be planned around the stalls rather than through them.
Turnmill Street and Farringdon Road. Office frontages and newer developments on heavily trafficked routes, less overlooked after the offices empty.
Charterhouse Square and the quieter streets. Period and institutional stock away from the main routes, where damage often sits unnoticed for days.
Warehouse Conversions And What That Means For The Glass
A good deal of the commercial stock here is converted industrial and warehouse building, and the glazing reflects it.
Original openings are frequently large, tall and non standard, because they were designed for light into a workshop rather than for a shop window. Where modern glazing has been inserted into those openings it is often a single oversized pane, cut to fit an opening that no catalogue matches. That makes replacement a bespoke order with a survey, a lead time and a price to match, and it usually needs proper access equipment to install.
Restoration is indifferent to all of it. The size of the pane affects how long we are on site, not whether the job is possible, and nothing has to be measured, manufactured or lifted.
Parts of the district also sit within conservation areas and there is listed fabric around Smithfield and Charterhouse Square. Where a building is listed, altering it can require consent and proceeding without that consent is an offence rather than a formality. Restoration changes nothing about the building, so the question does not arise.
Replacement Against Restoration
| New glass | Restoring the pane | |
|---|---|---|
| Lead time | Weeks for an oversized or specified unit | Usually the same day |
| Rated security glazing | Specification must be reproduced exactly | Unit and rating untouched |
| Warehouse conversion openings | Survey, bespoke cut, access equipment | Size affects hours on site, nothing else |
| Security grilles and shutters | Often have to be removed for fitting | Masked and left in place |
| Meanwhile | Boarded frontage in a district full of buyers | Nothing covered at any stage |
| Listed and conservation fabric | Consent may be required | Nothing altered, nothing to apply for |
| Cost | The unit, the fitting and the trade lost | Up to 90 per cent less |
The arithmetic is set out at glass replacement vs protection: the true cost, and the decision at should I replace or restore etched graffiti glass.
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Identifying What Is On The Pane
Three sorts of damage present similarly and each takes a different route.
Paint or marker sits proud of the glass. Opaque colour, defined boundary, and a fingernail meets a step at the edge of it. Solvent removes it and the pane beneath is undamaged.
Acid etching occupies the surface itself. Washed out and cloudy while still passing light, with a faint roughness sitting level with the glass rather than above it. The boundary softens where the gel migrated before being cleaned away. Viewed from a lit interior it is markedly more apparent than from the street.
Scratching has been cut mechanically. Narrow, bright, ruled lines from a blade, a stone or a key, into which a fingernail drops.
There is a photographic comparison at glass scratching vs acid etching, and the clouded look is examined at white frosty window graffiti. Background on the spread of the method is at the rise of acid-etch vandalism in London.
What Happens In The First Hour
Residue still on the pane is an active chemical. The gel injures skin and eyes. Nobody should handle it, and on a trade frontage that means telling the porters and the cleaning contractor before they arrive, not after.
Keep blades and abrasive pads away from it. Scraping introduces permanent scoring into glass that would otherwise recover fully, and drawing a cloth across wet gel carries the damage onto panes that were unaffected.
Proprietary removers do nothing. There is no film of paint for them to dissolve, and they add an unknown chemical to a surface that may be coated or filmed.
Where residue is visible and it is safe, flush it with cold water in quantity, gloved and with eye protection, letting it carry away rather than wiping it across the glass.
Photograph it immediately, dated, from both faces. On a rated or specified pane, photograph any etched marking or kitemark on the glass as well, because that identifies the specification.
Report it as criminal damage and keep the reference. An insurer will want it before engaging. What to do and in what order is laid out in what to do when your shop window is vandalised.
The Restoration Process
Establishing the pane. Float, toughened, laminated, coated, mirrored, sealed unit or security rated, whether any film is applied and to which face, and how far the acid has penetrated. On Hatton Garden frontages this step determines what documentation follows as well as what method we use.
Depth reading and a concealed trial. The method is proved on a small section out of view before the full pane is committed to.
Masking and containment. Frames, gaskets, seals, grilles, shutter guides, vinyl and signage are protected. Slurry is contained and kept off the footway, which around the market means keeping it clear of a route that trade vehicles are using.
Graded abrasion. Successive stages, each finer than the last, lift a depth of glass no eye could measure, carried well beyond the mark so the treated zone fades rather than terminating at a line. Work only the lettering and what remains is a dished patch, a shallow lens ground into the pane, distorting everything seen through it. On a large warehouse conversion window that distortion is visible the length of the street.
Cerium oxide finishing. The remaining haze is removed under wet cerium oxide, assessed from the side where daylight passes through the pane rather than reflects from it.
Inspection from both faces. Checked from the street, from inside against the interior lighting, and at an oblique angle, because on a narrow street that is how the glass is seen most of the time.
A single pane is normally finished within three hours. The removal method is documented at acid etched graffiti techniques and removal methods, the finishing at how to polish shopfront glass to optical clarity, and the materials at how to use cerium oxide glass polish.
Where restoration will not work we say so before anything begins. Acid that has travelled unusually deep into the pane, a sealed unit whose seal had already failed, or a functional coating lying in the path of the work each mean the glass genuinely needs replacing, and that opinion is given in writing at assessment.
Work Completed In This Part Of London
- Acid etched graffiti removal in Farringdon
- Acid etched graffiti removal from glass in Shoreditch
- Emergency acid etched graffiti removal in Dalston
- Graffiti and acid etched graffiti removal in Soho
Surfaces We Treat Around Farringdon
- Laminated and security rated shopfront glazing, including jewellery quarter frontages.
- Float glass and oversized window panes in converted warehouse openings.
- Toughened glass in entrance screens, trade doors, balustrades and shelters.
- Sealed units, treated on the outer face with the cavity and its seal left intact.
- Mirrors and mirrored panels in showrooms, bars and display cabinetry.
- Obscured, etched and manifestation glass, where the existing pattern has to be reproduced rather than taken off.
- Glass block in industrial conversions, lightwells and stair cores.
- Trade entrance thresholds and facings in polished granite or polished marble.
- Stainless steel and polished metal on grilles, shutter boxes, frames and display fittings.
Any worked or polished surface suffers from the same gel. On a jewellery frontage the grille and the steel surround are marked as often as the glass, and everything is dealt with on one attendance.
Occupiers We Act For
Jewellers and trade premises. Rated glazing restored without removing the unit, with written confirmation of what was done for the insurer.
Market and trade businesses. Attendance built around the nocturnal clock rather than against it.
Design studios, showrooms and creative offices. Oversized warehouse glazing restored to full clarity outside working hours.
Bars and restaurants. Worked between services, which in this district can mean mid afternoon rather than early morning.
Managing agents and building managers. Mixed use and converted stock, with reporting formatted for recharge and for listed building records.
Where The Cost Falls
The lease determines it. The repairing covenant establishes whether the shopfront falls inside the demise, which on the Cowcross Street and Hatton Garden frontages it usually does, while communal entrances, stair glazing and the elevation itself generally belong to the landlord and are recovered through the service charge. On a converted warehouse building that boundary is often further out than expected, so the demise plan is worth reading alongside the wording.
On insurance, weigh our figure against the excess before notifying anybody. A single restored pane will frequently fall beneath it, and a claim producing nothing still registers at renewal. Several panes or a whole frontage usually justifies claiming. For a jeweller there is a further consideration, which is that the written confirmation the unit was not removed or altered may matter more to the broker than the claim itself.
Reducing The Chance Of It Returning
Bringing the pane back deals with what has already happened. It discourages nobody, and frontages on the market streets and around the station approaches are marked more than once with some regularity.
A sacrificial film bonded to the outer face is built to be ruined instead of the glass. It strips off and is renewed quickly at a small share of restoring the pane again. On rated security glazing the specification of any added film needs checking against the existing arrangement rather than assumed, which is a short conversation worth having before anything is fitted.
The subject is covered in full at anti-acid etched graffiti protection, including the principle behind it, how long it stays serviceable, what fitting costs and its effect on the appearance of the glass. Where the window is a display case, protecting retail displays from glass vandalism covers the specifics.
Districts Adjoining Farringdon
The service in full, with our process video and the complete question set, is on the main acid etched graffiti removal page.
Farringdon Acid Etched Graffiti Removal: Frequently Asked Questions
Can the pane be saved or does it need replacing?
Saved, in the large majority of cases. Only a very thin skin of the glass has been attacked, and the work removes that skin evenly across the affected zone and polishes the clarity back. Replacement becomes necessary only where the acid has travelled unusually deep, the unit had already failed, or a coating lies in the path of the work.
We are a jeweller. Will restoration affect our insurance specification?
It should not, because the unit is never removed. Its construction, its interlayer and its rating are untouched, since all that happens is a microscopically thin layer being taken off the outer surface. We issue written confirmation of exactly that, alongside the dated photographs, so it can go to your broker if it is asked for.
What about our security grille?
It stays where it is. We mask the grille, the shutter box and the guides and work on the glass behind them. Replacement is where grilles become a problem, because a fitter usually needs them removed first.
When can you work around Smithfield?
Mid afternoon is normally the genuinely quiet period there, once the market trade has finished and before the evening starts. Early morning, which suits most of London, is the worst possible time on those streets.
Our unit is on Leather Lane. Does the market get in the way?
It shapes the timing rather than preventing the work. We attend before the stalls are set up or after they have cleared, and we plan that before quoting rather than discovering it on the morning.
The window is an oversized pane in an old warehouse opening.
That is precisely where restoration earns its keep. A pane like that has to be surveyed, cut to order and installed with access equipment if it is replaced. Restoring it means more hours on site than a small window, and nothing else changes.
Do we need to close or board up?
Neither. The pane stays in the frame from start to finish, so there is nothing to cover and no reason to stop trading.
Will the treated area be visible afterwards?
It should not be. The work is carried well past the mark and faded out so there is no boundary for the eye to find. The failure to avoid is polishing the tag alone, which leaves a shallow lens in the pane that distorts whatever is behind it.
There is scratching in addition to the etching.
Both are addressed in one attendance by the same graded abrasion and polishing. Depth sets the limit, and a particularly deep incision occasionally cannot be recovered.
Can you treat laminated, toughened and sealed units?
All three. The damage is almost always on the outer face, so a sealed unit is worked from outside and never opened. The method differs by type, which is why the pane is identified before anything starts.
What about the steel surrounds and display fittings?
The same gel damages any polished metal, so grilles, frames, shutter boxes and display fittings are all affected and all recoverable, and they are dealt with alongside the glass.
Our building is listed. Does that change the answer?
It reinforces it. Consent can be required to alter a listed building and proceeding without it is an offence, whereas restoration leaves the fabric exactly as it was.
What does it cost?
Measured against replacing the same glazing, counting the unit, the fitting, any grille work and the trading lost while boarded, restoration comes in up to 90 per cent below. Our figure depends on the area affected, the depth, the specification of the pane, the access and whether protective film follows. It is confirmed in writing beforehand. No lazy contractors. No hidden fees.
Should we notify insurers?
Compare our figure with the excess first. A single pane restored will often fall under it, in which case notifying achieves nothing and still shows at renewal. Several panes or a full frontage usually justifies a claim.
The damage is several months old. Is it still treatable?
Almost always. Age slows the work because weathering settles into the pitted surface and more has to be taken back, but the pane still clears.
How should we start?
Send photographs from outside and inside, and if the pane carries an etched specification mark, photograph that as well. It tells us what the glass is, which decides both the method and what documentation you will need afterwards.
Do you need graffiti removed from your property? Get a fast, hassle-free quote today! Click here to get a professional graffiti removal quote or call us today on: 020 8050 5997
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