'Lignin, a substance in wood, changes when exposed to oxygen; that makes white paper turn this color as it ages'
yellow
SCIENCE: Lignin, a substance in wood, changes when exposed to oxygen; that makes white paper turn this color as it ages
Lignin, a substance in wood, changes when exposed to oxygen; that makes white paper turn this color as it ages
Lignin, a substance in wood, changes when exposed to oxygen; that makes white paper turn this color as it ages
SCIENCE
yellow
SCIENCE