Fold-grǽg

According to the Old English Dictionary:

fold-grǽg

adj. [grǽg grey] Earth-grey, earth-coloured; instar terræ cānus :-- Eá of dúne sceal foldgrǽg féran earth-coloured water shall proceed from a hill, Menol. Fox 521; Gn. C. 31. fold-græg