May one consume a food exhibiting triboluminescence on Shabbos? Triboluminescence is where light is created from a material being crushed, rubbed, or ripped apart.
When foods are infused with very low concentrations of Methyl salicylate, they can exhibit triboluminescence, such as LifeSavers Mints Wint O Green (which at the time of posting this question are not Kosher). Would chewing foods like this for the purpose of Achila be considered a Melacha (like Mav'ir)? What about chewing it for the purpose of creating light/demonstrating its properties?
In a similar vein, what about rubbing 2 quartz crystals together to produce light?