Zum mikroskopischen Nachweis von Reaktionsholz (Druckholz) in thermo-mechanischem (TMP) und chemo-thermo-mechanischem Holzstoff (CTMP) der Fichte

Compression wood can be qualitatively identified in thermo-mechanical and chemo-thermo-mechanical pulps by the colour reaction developed by Wiesner (1878) using an ethanolic solution of phloroglucinol (C6H3(OH)3) acidified by hydrochloric acid. Compression wood cells appear dark red coloured in comparison to spring and summer wood cells. This is due to the relatively high lignin content in compression wood.