29. Solving a chemistry problem

10. The alchemist and astrologer of the Bukhara emir once said that he could show his master “shaitan” - the “devil”, taking the form of a liquid devouring gold. The alchemist showed the khan how “Shaitan” is born. It absorbed the gaseous red-brown oxide into another, liquid oxide. This produced a strong acid and a new gaseous oxide - colorless, which in air again turned into a brown gas. Then the alchemist mixed the resulting strong acid with table salt and threw a gold ring into the mixture. The ring began to become covered with gas bubbles, and then disappeared completely... The emir ordered the vessel with the devilish liquid to be sealed and buried in the ground, and the alchemist to be imprisoned in a dungeon. Does this legend have a chemical meaning? Support your answer with appropriate equations.