Dyed Spot in Ocean Helps Find Sunken Submarine

Popular Science, syyskuu 1937

To guide rescuers to sunken submarines, and reveal the fate of ships and planes lost at sea, a French inventor proposes dyeing the ocean. Besides the marker buoys that submarines now release in case of accident, he suggests that ocean craft carry self-releasing packages containing fifteen to twenty pounds of a dye like fluorescein, which will give a yellowish-green color to more than 20,000,000 times its weight of water. Visible to aircraft fifteen miles away, the spot should last twenty-four hours.

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