Mineral streaks, sap stains (blue, colored sap stains), wood discoloration during storage
http://baza.sveza.ru/eng/index.php?pid=2&pr=2&id=16&def_id=16&full=1Mineral streak is wood blanching without disguising its structure.
Blue is gray sap stains with bluish or greenish shades.
Colored sap stains are orange, yellow, and pink (up to light purple), and brown sap colors.
|Measured by the length and the width of the area occupied, or expressed as a percentage of the total plywood sheet area.|