Sulfurous Anhydride (Sulfur Dioxide): a chemical compound containing tetravalent sulfur, with the formula SO₂; it is a gas with a pungent, suffocating odor, 2.26 times denser than air, harmful to animal and plant life.
Sulfurous Anhydride (Sulfur Dioxide): a chemical compound containing tetravalent sulfur, with the formula SO₂; it is a gas with a pungent, suffocating odor, 2.26 times denser than air, harmful to animal and plant life.
IGR (Rivista Italiana di Gemmologia/Italian Gemological Review) è la rivista gemmologica internazionale italiana, nata nel 2016 da Gem-Tech con l’obiettivo di sviluppare in Italia un network informativo per Gemmologi e per professionisti quotidianamente impegnati nel settore delle pietre preziose.
IGR – Rivista Italiana di Gemmologia, the Italian Gemological Review, is the leading International Gemological Magazine in Italy masterminded by Gem-Tech Gemological Institute, a broad information framework for Gemologists as well as professionals involved daily in the gemstone business.
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