Bronze
On the label: Bronze · Metal
What it is
An alloy of copper and tin, browner than brass. Used in cast jewelry and some watch cases; develops a patina.
Metals: Solid metals: what the piece is made of all the way through. Purity is written as karat (gold) or parts per thousand (925 silver, 950 platinum).
Wikidata: Alloy of copper and tin. Q34095 →
In the research
51 PubMed papers mention it with jewelry, allergy, eyewear or UV; the three most recent:
- Dynamic hydrogen-storage reservoir in ruthenium-hydrogen tungsten bronze for highly efficient photocatalytic ammonia synthesis · Journal of colloid and interface science, 2026
- Tracing socioeconomic change and emerging elites in 4th-3rd century BCE: Metalwork from the Amber Road Corridor · PloS one, 2026
- Animals in Brick and Bronze: Katharine Lane Weems, Biology, and the Harvard Biological Laboratories Building, 1930-1937 · Journal of the history of biology, 2026
A paper is a paper, not a verdict: titles are listed so you can read them, and a study on one fabric or one filter says little about the piece in your hand.
Other metals
Clasp & Lens describes materials from the public record and does not appraise, grade or test pieces; what a listing states is the supplier's statement. If a piece causes a rash, take it off; a reaction that spreads or blisters is a doctor's question, and sunglasses are no substitute for impact-rated eye protection where that is required.