Did Neanderthals use CHEMICALS to light fires?

Did Neanderthals use CHEMICALS to light fires? Extinct early humans may have ground rocks into a powder to make wood more flammable They are often depicted as big, brutish and not terribly bright, but Neanderthals may have actually been sophisticated chemists who harnessed the power of explosive materials in rocks. Scientists claim to have uncovered evidence that the extinct species of early human used powdered manganese dioxide to help them light fires 50,000 years ago. Blocks of the dark material have been found at sites inhabited by Neanderthals in south west France and was thought to have been used to produce a powder to decorate their bodies.