https://tariquesani.net/blog/2002/11/17/the-most-commonly-used-phosphorescent-material-used-is-zinc-sulfide-mixed-with-copper/ Pediatrician and a Forensic Expert. A passionate PHP geek. Currently CTO, SANIsoft. Also a photographer, bird watcher, nature lover and a FOSS enthusiast. Mon, 19 Sep 2016 13:33:04 +0000 hourly 1 https://wordpress.org/?v=4.5.3