The production of hydrogen cyanide (hydrocyanic acid) out of the sulfuric acid and Berlin-blue was discovered by Swedish chemist Carl Wilhelm Scheele in 1782. French chemist and physicist Joseph Louis Gay-Lussac prepared pure liquefied hydrogen cyanide in 1811.
Chlorine was discovered in 1774 by Carl Wilhelm Scheele, a German / Swedish pharmaceutical chemist. He also discovered nitrogen, oxygen, barium, manganese, and wolfram, not forgetting organic acids like hydrofluoric, hydrocyanic, and arsenic acids.
Throughout 2020 I will share with you a compilation of information, a self-tailored Chemical Agent Database, I use as knowledge basis when conducting CBRN trainings myself.
Chemical detection requires three distinct components: proper techniques, suitable equipment, knowledge and experience to use and apply both tools and techniques.