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Natron is a salt mixture that occurs naturally in arid environments. It's white to colourless when pure, but shades to grey or yellow when impure.
The most important source for natron in 48 BCE was the village of Nitria in the middle of Saqqara Nome. After hunting down and killing Rudjek, the nomarch of the nome and a member of the Order of the Ancients, the Medjay Bayek of Siwa was taken to Nitria by Nefertari, the chief healer of the village, when she found Bayek injured near the Bent Pyramid.
The following year, Bayek returned with the intent to thank Nefertari for helping him; Rudjek's widow still lived in the village, as did Rudjek's lover, and the villagers believed Bayek killing Rudjek had 'cursed' the village, for the nearby shrines of Anubis had been disturbed.