bad news bears a ton of spices are full of lead (consumer reports has some info but it’s partially paywalled) so is that 1984 Garfield mug and most fiber sources and anything brightly colored from before 1978 (4 yrs after women were allowed to get credit cards in their name) and many water bottles with a vacuum sealed interior due to leaded solder or some shit
My guess is leftover fallout from leaded gasoline