2020. January 27. Monday
Those minerals are liable to fluorescence which have some defects in their crystal-lattice and the places of defects are filled in by metal atoms. These metal atoms are ready to interact with ultraviolet radiation, their electrons going to higher energy level during to radiation and emitting the fluorescent light when falling back to the original level after the radition has been completed.
This year, The Hungarian Jewish Museum and Archives was first opened 100 ago. On occasion of the anniversary, the institution is undergoing a complete renovation. Perhaps the most important moment of that is that the permanent exhibition that has not been changed for more than thirty years is to be redone.