They’ve become a fashion accessory, especially since the company that makes the cups, Stanley 1913, has made use of influencer culture to target women and make the tumbler’s sales skyrocket. The reach of the bottles has been amplified by social media users. But social media giveth and social media taketh away. Some Stanley owners, hoping to check the claims, started to use home lead-testing kits, which experts say are not reliable. A sendup of the Stanley cup phenomenon on “Saturday Night Live” over the weekend — a sketch called “Big Dumb Cups” — even mentioned the lead in passing.

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Persons: Stanley tumbler, They’ve, Stanley, ” YouTubers, —