A new technic; tannin-iron II.
D001578:Benzopyrans; D004396:Coloring Agents; D007501:Iron; D013194:Staining and Labeling; D013634:Tannins
D001578:Benzopyrans; D004396:Coloring Agents; D013634:Tannins; D007501:Iron
IRON; STAINS AND STAINING; TANNIN