File:TLC black ink.jpgAll following user names refer to en.wikipedia. 2004-12-28 22:29 Natrij 676×507×8 (60799 bytes) {{GFDL}}Separation of black ink on TLC plates English
File:TLC black ink (cropped).jpgrefer to en.wikipedia. 2004-12-28 22:29 Natrij 676×507×8 (60799 bytes) {{GFDL}}Separation of black ink on TLC plates English determination method: SHA-1