gersa

gersa [OF gerse < cerusa] 1 white pigment (of var. recipes), esp. as cosmetic. recipe ‥ olibani, ‥ ceruse, coralli ‥ cristalli boracis, ~e omnium ana ȝ iij Gilb. III 166. 2; ~a est quoddam album quod fit de radice brionie, cucumeris agrestis et similium SB 22 (cf. Alph. 74); jersa ‥ proprie fit de jaro et serpentaria, cerusa vero de plumbo, que pessima est; corrumpit autem dentes et facit os fetere SB 24; ~a, i. serpentina Herb. Harl. 3388 f. 80; ~a, starch, for karchys PP; Alph. 37 (v. cerussa a). 2 (? by conf.) black pigment. Cf. gersare b. blek, ‥ attramen, attramentum, ~a, blacta CathA.