Seawater is…. salt!
Published in Nederlands Tijdschrift voor Natuurkunde 80, 253 (Translated from Dutch) in 2014
G.P. Können
A ‘broken rainbow’ teaches us that seawater is salt – in the same way that the Venus rainbow once taught us that the cloud drops on Venus are sour. NB: the topic is also discussed in my article ‘Rainbows, halos, coronas and glories: beautiful sources of information’, BAMS 2017.