Question on oxidation of brass inserts in shafts


So I have this Jacoby ultra pro in 5/16x18 using a brass insert. Been using it over a year with no issues. The pool hall in my area just opened today after 3 months, and when I took out my cue from the locker, a blueish green powdery substance could be seen in the thread of the male joint protector, which I believe is the brass oxidizing.

So my question is, is this bad?
Did 3 months of inactivity cause it to oxidize? Could it possibly have something to do with the manufacturing, or was it my own neglect. And if it's bad, how can I fix it?

Thanks in advance for any help you guys could give me.

Kim Bye

AzB Silver Member
Silver Member
Brass can tarnish if it's in high humidity climate. Use some metal polish on a Q-tip. Make sure you wipe off all rest of polish and gunk when your done.


Thanks for the help, so I'm guessing for humid areas, a shaft with wood or phenolic threads would be more ideal?