I was told years ago that when gold is less than 3 molecules in thickness (or was it microns) the colour changes to green.
Given current cost cutting measures, the epaulette standard in Singapore Airlines is -
4 Green Bars = Captain
3 Green Bars = Senior First Officer
2 Green Bars = Junior First Officer
1 Green Bar = Second Officer
0 Green Bars = Cadet Pilot
Regards,
Old Smokey