Green Dye for Downed Airmen?

[Viking]

Regarding the sea rescue ( I'm on holiday and have no references!) the Walrus and PT-boats springs to mind, On the other side there where “Shnelboots” and some kind of FW sea-rescue and some kind of huge buoy in which a downed airman could take shelter and call for help. Could have been British, not sure. And as I recall it was the Brits who on Churchill's order started the shooting on red cross airplanes.
Regarding the dye I'm not sure they had that at the time. We had it on our live-vests in Sweden in the 70s and I had great fun as I colored the fountain in our city square lemon green!
Bye the way the German vest made of Kapok where regarded as superior to the Brits inflatable ones as they could be punctured.

Regards

Viking