Tachu MIYA, a doctor of Bingo no kuni (Bingo Province), invented many devices to prevent 'kedae,' but the gas mask, 'fukumen' (literally, a fortune mask), which had bainiku (the pulp of umeboshi) between an iron frame and a fine piece of silk, is reported to have had a great effect because it prevented the infiltration of mine dust thanks to the acid content.
備後国の医師宮太柱は数々の「けだえ」防止の装置を発明したが、鉄の枠に梅肉を挟み薄絹を張った防毒マスク「福面（ふくめん）」は、酸の効果で鉱塵を寄せつけず効果が絶大だったという。