![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/1/13/The_grave_of_Hugh_Marshall%252C_Grange_Cemetery.jpg/640px-The_grave_of_Hugh_Marshall%252C_Grange_Cemetery.jpg&w=640&q=50)
Hugh Marshall
Scottish chemist / From Wikipedia, the free encyclopedia
Hugh Marshall FRS FRSE FCS (7 January 1868 – 5 September 1913) was a Scottish chemist who discovered persulphates in 1891.[1] He was the inventor of Marshall's acid.[2] In 1902 he proposed the modified sign of equality which became standard in chemistry to represent dynamic equilibrium.[3]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/8/87/Peroxydisulfuric-acid-3D-balls.png/640px-Peroxydisulfuric-acid-3D-balls.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/13/The_grave_of_Hugh_Marshall%2C_Grange_Cemetery.jpg/640px-The_grave_of_Hugh_Marshall%2C_Grange_Cemetery.jpg)