Foundries and workshops began, though slowly, to supply tools and machines; the earth was rifled of her treasures, Natron was wrought, saltpetre works were established, and gunpowder was thereby procured for the army with an energy which recalled the prodigies of activity of 1793. With his usual ardour in the cause of learning, Bonaparte several times a week appeared in the chemical laboratory, or witnessed the experiments performed by Berthollet and Monge.
"The Life of Napoleon I (Volumes, 1 and 2)"
John Holland Rose
This fellow has been pickled in Natron, and looked after in the most approved style.
"Round the Red Lamp Being Facts and Fancies of Medical Life"
Arthur Conan Doyle
Having so done they keep it for embalming covered up in Natron for seventy days, but for a longer time than this it is not permitted to embalm it; and when the seventy days are past, they wash the corpse and roll its whole body up in fine linen 74 cut into bands, smearing these beneath with gum, 75 which the Egyptians use generally instead of glue.
"The History Of Herodotus Volume 1(of 2)"
Herodotus