My mod 65 sits in the cushion of the back of my computer chair as my "go-to" if necessary.
I went to clean and inspect yesterday and shells would not extract. After several attempts, I ended up pushing them out with a pencil. All were covered with a green slime corrosion looking stuff. As of last cleaning, all were clean dry, weapon was lubed as per normal, maybe 4 months ago.
Cleaned them all, and cylinders, re-lubed checked action and put back in hiding.
Questions are What was that green stuff?
Why now and never before?
Could it be from condensation from my body heat when sitting there, and cooling after I get up?
Also it is in a leather holster.
Also the green looked like the "green fuzz" in a copper wire when it corrodes.
This is a stainless gun, with brass shells, copper jacketed.
Has me in a quandary, so I will keep an eye on it.
Okay, Everybody chime in!

I believe it is called verdigris. it is a copper-brass sort of corrosion. do NOT store you weapon long term in a leather holster. modern leather is acid tanned and is hydroscopic. it attracts and holds moisture. dump the ammo, clean the gun thoroughly and get another storage method. I have heard that ballistic nylon holsters have much less tendancy to hold moisture, same with kydex.

I remember , back in the day of the 38spcl then 357 mag. and S&W revolver the police carried, they were issued black Bianchi holster and belt rigs and ammo was always in nickel plated cases. Brass goes green in short order and dissimilar metals may have nothing to do with it, just leather , body condensation, heat/cool, the elements and a little time. See if you can get some nickel cased loads , that should help.
Gary
You have to keep a close watch on brass cased ammo , in revolvers at least

You have now found out that stainless steel guns are not rust proof. I had a model 60 that rusted under the grips. Don't store in leather and keep them waxed.

__________________
Tom
NRA Pistol Inst

No gun should be left in a leather holster when not actually being carried - nor should brass cased ammo. Verdigris will be the result if it is done!

You can use a nylon holster and Nickel Plated cartridges and that should eliminate the problem.

Your body heat acts as a catalyst in the chemical reaction - forming the verdigris. Clean well before installing new Nickel cartridges and get a nylon pouch.

Thanks to all! No longer SNAFU and on the road to recovery!
The holster is older but will be eliminated and new ammo purchased.
Thanks again to all!