This Technical Specification specifies a test method using water immersion test for assessing the
discoloration of coatings on tannic wood (oak, chestnut) by tannin staining due to wood extractives. Leachates of coated and uncoated wood are collected after the immersion procedure and their colour is compared. The colour of the coated wood before and after immersion tests is also compared. This document does not specify acceptance values for colour differences that can be tolerated and it is not applicable to staining caused by knots for which there is a different test method.
Registration number (WIID)
73036
Scope
This Technical Specification specifies a test method using water immersion test for assessing the
discoloration of coatings on tannic wood (oak, chestnut) by tannin staining due to wood extractives. Leachates of coated and uncoated wood are collected after the immersion procedure and their colour is compared. The colour of the coated wood before and after immersion tests is also compared. This document does not specify acceptance values for colour differences that can be tolerated and it is not applicable to staining caused by knots for which there is a different test method.
