| Show GEMS DYED WITH RADIUM artificial color can be given to precious stones by use of the costly metal with chloride anti and bromide of radium at a milligram or a grain tho the use of radium to give artificial color to precious stones lias has littie industrial promise to give a imore core accurate idea of the possible changes change s armbrecht Arin brecht in london has been experimenting for many months anti and has produced so some soe e remarkable lea habl effects upon color about white sapphires sapp hires puro pure oxide of aluminum were kept in contact radium two or three weeks about 70 per cent turned yellow the shades ranging from lemon to dark orange a few apparently ly from another locality be clime camo green pinkish or amethyst color and a very few changed to rose color A light blue was imparted to two or three too light to give value approaching pro prot aching telling that of the much prized deep p blue sapphires sapp hires palo pale emeralds were wera somewhat darkened by radium but were not given tho the deep green of the expensive tones stones drown brown diamonds were bleached almost white nothing being obtained like alk o the beautiful blue gem gein into which sir wm crooks croo ks transformed a yellow diamond amethysts were altered by radium into smoky or yellow quartz dirty appear 1 ng pearls cleaned to a dearer walto abi to but opals were not nm amenable enable to treatment |
