Retention of red color in Taiwania (Ttaiwania Cryptomeriodes Hay.) heartwood

摘要

Taiwania (Taiwania crysptomeriodes Hay.) is one of economically important tree species indigenous to Taiwan. The heartwood of Taiwania is yellowish red with distinguished purplish pink streaks. Unfor- Tunately, The "red" color is susceptible to change to dull black after exposure the heartwood to natural environment. This discoloration is a serious defect that decrease the value of Taiwania products. In order to preserve the red color or Taiwania heartwood, aliphatic polyurethane (PU) clear coatings containing Tinuvin photostabilizer coupled with pretreatment using photostabilizers, polyethylene glycol (PEG), semicarbazide (SCB) and acetic acid, were used.