Oh wow. Austin, for reasons best known to himself, shone his little UV light that he uses for setting UV sensitive resin at the inside of the empty rice-and-lentils pot. Which is cooked with turmeric, because turmeric contains curcumin which is good for dodgy knee joints.
It turns out that curcumin has other properties besides fixing knees - it also glows under UV light!
Apparently he'd been using the light for setting the resin to fix up a broken mounting on the headlamp that the wild boar smashed. But that's another story...