http://www.sciencemadness.org/talk/viewthread.php?tid=706&page=2 (http://www.sciencemadness.org/talk/viewthread.php?tid=706&page=2)
:Mercury salts aren't as precious as they're made out to be. It was easy to prepare HgCl2 by stirring rapidly (with a magnetic stirrer) with an excess of 27.5% H2O2 and 38% HCl, then boiling to remove remaining H2O2 and HCl, and then crystallizing.
Post 266873 (https://www.thevespiary.org/talk/index.php?topic=9838.msg26687300#msg26687300)
(Mountain_Girl: "Embellishment of Zygoat's HgCl2 synth", Methods Discourse)