My brother's submerged reloaded ammo and primed cases showed the lime green stuff along with duller verdigris. Submerged empty and unprimed cases showed only verdigris. The contrast between these greens is unmistakable. I pulled a bullet from one of the well crimped .38 special rounds and water certainly infiltrated the casing causing powder clumping and a damp primer with a hint of the nasty green stuff.
Military ammo - the commie stuff and .30 Carbine - showed no lime green gunk probably because the military seals ammo a bit better.
No, I had no chance to shoot any of his reloads. He lives in NJ and I live in gun friendly LA.