Just under 200 years later a Londoner named Henry Bollmann Condy was a chemist. He had an interest in disinfectants and made some things like "ozonised water". He found that when he melted pyrolusite with sodium hydroxide and dissolved it in water, it made a solution that had good disinfectant properties. He patented this solution, and sold it as "Condy's Fluid". The problem was that the solution was not very stable. This was fixed by using potassium hydroxide rather than sodium hydroxide. This gave a more stable material. It also was able to be dried to the just as good potassium permanganate powder. This powder was called "Condy’s crystals" or "Condy’s powder". Potassium permanganate was easy to make so Condy tried to stop other people from making it and selling it themselves.