Old thru hulls and seacocks?

[OldFrog75]

If the fittings on an older boat ('81 Ericson for example) are green(ish), does that mean they are brass instead of bronze or do both materials turn green with age?

[Cheechako]

Bronze turns green, some brass will or may turn reddish also. My guess is they are bronze. Are tehy tapered seacocks, ball valves, gate valves or what?