BIBO CRYSTAL NO FURTHER A MYSTERY

Hygroscopic crystal elements deteriorate when they're not always stored in sufficiently dry air (or maybe a dry purge fuel). This applies e.g. to KDP and BBO, As well as in a lesser extent to LBO. It can be practical to keep this kind of crystal in a to some degree elevated temperature, that makes it much easier to hold it dry.Inertness to Dampness