dr.kol
11333
I checked from my old Divemaster
textbooks.
Red colour is "filtered" nearly totally in 5 meters and totally in about 6 meters. Orange disappears next and by 10 meters it's nearly gone and just after 12 meters totally lost.
The best colour underwater is blue. It can be fully separated in 40 meters (the practical limit of scuba diving) and green is visible fully till about 30 meters and still can be partly separated to 40 meters.
I think manufacturers making i.e. the minute hand of a diving watch in red or orange, are really joking.
Naturally, during the diving training we tested how different colours behave and i.e. a red small balloon lost all of its colour in 40 meters. In practical terms this means that a watch with red/orange minute hand and minute scale is not really well readable in normal scuba diving depths. While i.e. Rolex diving watches work very well - likewise BB Fifty Fathoms.
Best, Kari