https://www.foodnetwork.com/healthyeats/news/throw-away-black-takeout-container-kitchen-utensils
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Research shows that black plastic contains toxic flame retardants, probably due to contamination during recycling.
A study published this month in Chemosphere looked at samples of different black plastic objects, from kids toys to sushi trays to black plastic food containers and utensils. They screened these black plastic items for bromine, an element used to make brominated flame retardants (BFRs) that are purposely added to products like electronics and furniture to make them less flammable. Of the samples that contained bromine, 85 percent contained BFRs, which aren’t considered safe for consumption at any level. The item with the highest level of BFRs (black costume pirate beads meant for kids) had a huge amount of BFRs, almost 3 percent by weight.
One type of BFR in particular, called decabromodiphenyl ether of decaBDE, was banned in the U.S. in 2021 (although manufacturers had until 2023 to remove it from their products) because research showed it was linked to the development of cancer, brain development and other health issues. Yet, decaBDE was found in nearly three-quarters of the black plastic items tested.