False heardwood

The color of oxidation stains of heardwood is brown, e.g. in beech or gray-brown e.g. in oak. Staining begins when oxygen penetrates the heardwood and comes into contact with phenolic compounds in the cells (oxidative staining of the core wood). This is associated with a decrease in the moisture content of the strain below 50%, tulle in the vessels and the death of parenchymal cells of the heardwood of the sawn log. Fungi are not involved in this process. Such a false hardwood does not affect the mechanical properties of the log, but reduces the efficiency of wood impregnation, reduces the value of veneer and later such logs are more easily attacked by fungi causing white rot, which already mechanically weakens the log.