My aunt and uncle both died of this, together with around 5 or 6 more people in the early 90s when one of their neighbors, an old lady, baked a cake for a birthday and mistakenly used Paris Green. She managed to poison all these people and, none survived, while she didn’t manage to have any of the cake and lived. Wanted to see if I can find anything online about this, but there’s not much saved from newspapers in Bucharest, Romania from that time.