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What about guitar pedal velcro tape?

[0] "Correlation between nanosecond X-ray flashes and stick–slip friction in peeling tape" (2008) https://www.nature.com/articles/nature07378

> Triboluminescence is a phenomenon in which light is generated when a material is mechanically pulled apart, ripped, scratched, crushed, or rubbed (see tribology). [...] Triboluminescence is often a synonym for fractoluminescence (a term mainly used when referring only to light emitted from fractured crystals). Triboluminescence differs from piezoluminescence in that a piezoluminescent material emits light when deformed, as opposed to broken. These are examples of mechanoluminescence, which is luminescence resulting from any mechanical action on a solid. [...] See also:

> - Earthquake light: https://en.wikipedia.org/wiki/Earthquake_light

- re: gold from earthquake-induced piezoelectricity in quartz: https://news.ycombinator.com/item?id=41442489

- re: sustainable alternatives to quartz countertops: https://news.ycombinator.com/item?id=36857929 :

> [...] make recycled paper outdoor waterproof vert ramps, countertops, siding, and flooring; but not yet roofing FWIU?

> - Sonoluminesence: https://en.wikipedia.org/wiki/Sonoluminescence



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