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Others trace its roots to the Egyptian name kēme,[n 1] meaning 'black earth', which refers to the fertile and auriferous soil of the Nile valley, as opposed to red desert sand.[1] According to the Egyptologist Wallis Budge, the Arabic word al-kīmiyaʾ actually means "the Egyptian [science]", borrowing from the Coptic word for "Egypt", kēme (or its equivalent in the Mediaeval Bohairic dialect of Coptic, khēme). This Coptic word derives from Demotic kmỉ, itself from ancient Egyptian kmt. The ancient Egyptian word denoted both the country and the colour "black" (Egypt was the "black land", by contrast with the "red land", the surrounding desert).[citation needed]