instagib
So, the sushi part is the lie in the article as you don’t heat sushi in the black trays.

I usually throw leftovers in the black containers and sometimes freeze them. Any effect from that?

We need to clean mop and dust more often, use non-black plastic utensils, and ventilate our homes. I found a set of wooden ladles so that helps yet need more experience with steel for frying to get rid of the plastic spatula.