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This Document Has Been Superseded
A newer publication replaces it: BSI BS EN 927-7
Paints and varnishes. Coating materials and coating systems for exterior wood. Assessment of knot staining resistance of wood coatings
This Technical Specification specifies a test method for assessing the discoloration of coating systems on wood due to wood extractives from knots.
The discoloration is measured by colorimetry and the result is stated as the colour difference between the coated surface on the knot and the coated surface beside the knot.
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