Can colored crystal glasses (there is no gold or silver on them, just the crystal itself is colored) that came from Jews that were not very frum but have not been used for over 25 years be kashered for use on Shabbos or even on Pesach after having been immersed totally for 3 complete 24 hour periods?
Answer:
One may use them after doing Hag'ala. If there is a concrete possibility that they will be ruined by the boiling water, than it is enough to soak them in water for 3 complete periods of 24 hours each.