Requirement is simple(!) - I have 30mm silvered glass balls that are originally Christmas tree decoration that I want to use in a very unconventional manner in a physics experiment. As far as I can tell the Aluminium is external. The balls are exceptionally delicate and the glass probably somewhat stressed i.e. they break easily if scratched.
So, would dilute NaOH be suitable or is there a better solution? Another requirement is that ideally the treatment does not raise the surface energy of the glass