there is probably someone here who knows more about this than me, but, i think the green/yellow color coding for chains and guide bars is a product of ANSI, whoever they are. i buy 99% of my chain by the roll and i avoid any type of low-kick-back types which are heavier, do not perform as well and are more difficult to sharpen. i like to say, "all my chains are black." i'm not cavalier about safety. i use a petzl hard hat, eye and face protection, gloves and lace to toe boots. i prefer carlton full chisel, but oregon is ok too. the sawtroll (from norway) was on here a while back saying that all chain is low-kick-back now, but i was in my local stihl boutique yesterday and saw boxed loops of 3/8" chain without any bumps or fins. since i'm not a millionaire, i didn't buy any.
i have often wished that someone would start marketing colored preset/tie straps. it's nice to have a reference point on a chain. never fails that you're half way through one side of a 32" chain and counting cutters and some guy comes in and asks you for your phone number.