“…According to previous reports the most promising of these agents are: hydroquinone (11,12,13), pyrogallol (12,14), lower aliphatic alcohols (15), sodium sulfite (I@, calcium oxide (16) and metallic magnesium and tin (9). According to previous reports the most promising of these agents are: hydroquinone (11,12,13), pyrogallol (12,14), lower aliphatic alcohols (15), sodium sulfite (I@, calcium oxide (16) and metallic magnesium and tin (9).…”