The most common skin allergy in the world used to sit on your nose bridge for sixteen hours a day. It wasn't a bad choice — just a metal whose downsides took a long time to figure.
Why nickel was in the alloy at all
Nickel on its own is a hard, silvery metal that barely reacts with air, water or sweat — which is exactly why metal-workers have leaned on it for over a century. It's also cheap and plentiful compared to something like silver or platinum. But frames were rarely made from nickel by itself. Its real value shows up when it's mixed with other metals: add it to copper and zinc and you get 'nickel silver' (though technically with no silver in it), add it to copper and iron and you get what our industry refers to as... Monel. In both cases, the nickel is what makes the mix hard-wearing, resistant to tarnish, and easy to cast or cut into the tiny, precise shapes a hinge needs. It's the same reason nickel turns up in stainless steel today — it's not there for looks, it's there to do a specific mechanical job.
That's why nickel silver and Monel became the default eyewear metals for most of the last century: cheap to source, easy to shape into fine hinge parts, and hard-wearing once plated. It was simply the sensible choice for a mass-produced frame. What changed isn't the metal. It's four decades of skin research showing what happens when that metal sits against your face for most of the day.
What actually happens on the skin
Nickel allergy works in two steps. Repeated contact with nickel dissolved in sweat first trains the immune system to react to it — this is called sensitization. Later contact then triggers the reaction itself: redness, itching, sometimes weeping skin, right where the metal touches (Ahlström et al., 2019). It builds up over time rather than happening on first contact, which is why something worn against the skin all day is a bigger risk than something touched now and then.
And this isn't a minor issue. Recently, a 2018 study tested over 3,100 adults across five European countries and found about 14.5% were sensitized to nickel — ranging from 8.3% in Sweden to 18.5% in Portugal. Women were roughly five times more likely to react than men (Schuttelaar et al., 2018). Nickel has been the single most common skin allergen found in testing for several decades running (Walsh & Wilkinson, 2006).
Why eyewear was always a special case
Most nickel contact comes and goes — a watch taken off at night, a belt buckle under clothes, earrings removed in the shower. Glasses are different. The nose bridge and temple tips touch the same small patches of skin for almost every waking hour, in a warm, sweaty spot — exactly the condition nickel needs to dissolve and get into skin. A Korean study looked closely at 42 patients with confirmed frame-related allergies. Under a microscope, nickel and chromium showed up right at the skin-contact points, at nearly 16% nickel by weight. The cause: tiny scratches, invisible to the eye, that wore through the plating and exposed the metal underneath (Kim et al., 2013).
Plated is not the same as nickel-free. A plated frame can test clean in the shop and still fail after a year of pocket scratches and cleaning cloths. In one documented case, a patient developed a confirmed allergy from a pair of glasses marketed as ‘nickel-free’ — the nickel turned out to be in the clear coating on the metal, not the visible metal (Glas & Egelrud, 1999). A label is a claim. Only a proper release test on the finished, worn frame proves it.
How regulation forced the change
Moving away from nickel wasn't a design trend — regulation pushed it forward, and the regulation followed the health data. Denmark restricted nickel release from consumer products in 1990 - more than 35 years ago, ahead of the rest of Europe, because rising allergy rates had become impossible to ignore. The EU followed with the Nickel Directive in 1994, later folded into a wider chemical-safety law (REACH). The rule: any item in prolonged skin contact can't release more than 0.5 micrograms of nickel per square cm. per week.
The regulation worked, and there are numbers to show it. A Danish hospital study found nickel allergy among young female patients (aged 2–30) dropped from 29.8% in 1992–1997 to 19.6% in 2004–2009 — a real, measurable decline, tracked in a group young enough to have grown up almost entirely under the new rule (Carøe et al., 2011). (The same study found a smaller rise in cobalt allergy over the same years — a reminder that cutting one allergen can push manufacturers toward another, unless both are tested for. Which is why testing today increasingly checks for both.)
Eyewear eventually got its own version of this test. The general nickel-release standard, EN 1811, doesn't actually cover spectacle frames and sunglasses — those are tested under EN 16128 instead, a method built specifically for how glasses fit and wear, last updated in 2025. The limit is the same, 0.5 µg/cm²/week, but the test looks at the whole frame as worn, hinges included, not just a flat piece of the metal.
What replaced it, and why
The materials that replaced nickel solve the same problem — a fine, workable, corrosion-resistant hinge metal — without the same allergy risk. Commercially pure titanium has no nickel in it at all, by composition, not by plating, which is why it can't fail the way a scratched, plated frame can. Properly treated stainless steel (316L or 304) does still contain some nickel, but a strong protective oxide layer keeps it locked in place, so release stays well under the legal limit. It's the metal treatment, not the absence of nickel, that makes it safe. Nickel silver and Monel, meanwhile, have mostly drifted down to the cheaper end of the market, where plating quality is least reliable.
One thing worth repeating from our last article: titanium-nickel ‘memory’ alloys, sometimes sold on the strength of the word ‘titanium,’ can actually contain 40% or more nickel by weight. Flexing impressively doesn't mean hypoallergenic. ‘Titanium’ on a spec sheet tells you one ingredient in the mix — not how much nickel is in there too.
Where this sits in our own range
This is exactly why it matters for us: every metal frame we at Read40 make is nickel-free both in the base metal and in the plating, not just on the visible surface. It's a smaller claim than ‘hypoallergenic,’ and a more honest one. Our metal range of reading glasses specifically has the range in Nickel free material. You can look for our styles here. - https://www.read40.com/collections/monk
References & further reading
Walsh G, Wilkinson SM. Materials and allergens within spectacle frames: a review. Contact Dermatitis. 2006;55(3):130–139. https://doi.org/10.1111/j.1600-0536.2006.00791.x
Kim IS, Yoo KH, Kim MN, et al. The fine scratches of the spectacle frames and the allergic contact dermatitis. Annals of Dermatology. 2013;25(2):152–155. https://doi.org/10.5021/ad.2013.25.2.152
Glas B, Egelrud T. Nickel in ‘nickel-free’ spectacle frames. Contact Dermatitis. 1999;40(4):217. https://doi.org/10.1111/j.1600-0536.1999.tb06041.x
Schuttelaar MLA, Ofenloch RF, Bruze M, et al. Prevalence of contact allergy to metals in the European general population with a focus on nickel and piercings: the EDEN Fragrance Study. Contact Dermatitis. 2018;79(1):1–9. https://doi.org/10.1111/cod.12983
Carøe C, Andersen KE, Mortz CG. Fluctuations in the prevalence of nickel and cobalt allergy in eczema patients patch tested after implementation of the nickel regulation in Denmark. Contact Dermatitis. 2011;64(3):126–131. https://doi.org/10.1111/j.1600-0536.2010.01832.x
Ahlström MG, Thyssen JP, Wennervaldt M, Menné T, Johansen JD. Nickel allergy and allergic contact dermatitis: a clinical review of immunology, epidemiology, exposure, and treatment. Contact Dermatitis. 2019;81(4):227–241. https://doi.org/10.1111/cod.13327
Ahlström MG, Menné T, Thyssen JP, Johansen JD. The European nickel regulation and changes since its introduction. Contact Dermatitis. 2017;76(6):382–384. https://doi.org/10.1111/cod.12775
EN 16128:2025. Ophthalmic optics — Reference method for the testing of spectacle frames and sunglasses for nickel release. European Committee for Standardization (CEN). https://standards.iteh.ai/catalog/standards/cen/bb76dfbf-b347-4c8d-804a-af09926ad035/en-16128-2025
Regulation (EC) No 1907/2006 (REACH), Annex XVII, Entry 27 — restriction on nickel and nickel compounds, consolidating the original EU Nickel Directive 94/27/EC. https://en.wikipedia.org/wiki/Nickel_Directive
