“…Prussian blue formed when the FeS reaction mixture with mercuric fulminate was treated with concentrated HCF. A solution of Na3SbS 4 (Schlippe's salt) gives a yellow precipitate with solid mercuric fulminate, followed by changes in color from green to black (126). With phenylhydrazine, solid mercuric fulminate turns olive green before changing to gray (127).…”