In 2017, scientists poured Rhodamine WT pink dye into Porter Hole Sink under Florida’s Lake Jackson; 35 days later instruments picked it up at Wakulla Spring through limestone caves
Scientists poured pink dye into Florida’s Lake Jackson to trace hidden water; about 1 month later, it appeared at Wakulla Spring through limestone caves
In 2025, US scientists poured 16,500 gallons of lye and bright pink dye into the Gulf of Maine, the first federally approved attempt to reverse the ocean's rising acidity