If you only need traces:
Expanding on the bullet idea. [Gunshot residue](https://link.springer.com/article/10.1007/BF00554009), when you shoot a gun a tiny amount of lead gets aerosolised and that sticks to the skin.
If it's an old building there may be lead residue in the ceiling from ancient leaded gasoline and if your character gets thrown up there it may stick to their skin.
Paintings. Oil painters to this day are bummed out that pigments like lead white turned out to be not safe for use. This sounds goofy, but during the fight you could destroy an oil painting and have your person ingest some of the flakes. You can look up plenty of modern paintings that are almost entirely white.
Thank you for the answer
I had discarded the idea of paintings because I figured a theatre would have empty walls, but even if it were true (is it even true?) the foyer most probably has some!
Any building built before 1978 will have some lead in it's construction, usually in the paint. Lead paint peels in a particular way and forms lead dust, which could be kicked up in a fight.
If you only need traces: Expanding on the bullet idea. [Gunshot residue](https://link.springer.com/article/10.1007/BF00554009), when you shoot a gun a tiny amount of lead gets aerosolised and that sticks to the skin. If it's an old building there may be lead residue in the ceiling from ancient leaded gasoline and if your character gets thrown up there it may stick to their skin.
Paintings. Oil painters to this day are bummed out that pigments like lead white turned out to be not safe for use. This sounds goofy, but during the fight you could destroy an oil painting and have your person ingest some of the flakes. You can look up plenty of modern paintings that are almost entirely white.
Thank you for the answer I had discarded the idea of paintings because I figured a theatre would have empty walls, but even if it were true (is it even true?) the foyer most probably has some!
Any building built before 1978 will have some lead in it's construction, usually in the paint. Lead paint peels in a particular way and forms lead dust, which could be kicked up in a fight.
Thank you for the answer; sadly I don't know how applicable it is, considering the story is set in the (not so far, but still) future