A reported 1984 experiment beneath Sweden’s frozen Lake Erken used red dye to study winter currents; the account said 95% remained in the upper seven metres after 26 hours

A widely repeated account holds that in 1984, scientists injected red dye under the ice of Lake Erken in Sweden and found that after 26 hours, about 95 percent of it remained in the uppermost seven meters. The "two teaspoons" figure often attached to this account does not match the dye quantities described in the underlying field research, so it should be treated as an unverified detail of the popular retelling rather than a number from the published study.

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