Tannin-filled River
Peter Chadwick/science Photo Library
Tahquamenon Falls In Winter #1
Jim West/science Photo Library
Amazon River
Tony Camacho/science Photo Library
Rose Wine #2
Karl Gaff / Science Photo Library
Tannic Acid Crystals #3
Marek Mis
Tannic Acid Crystals #5
Marek Mis
Tahquamenon Falls In Winter #2
Jim West/science Photo Library
Rose Wine #1
Karl Gaff / Science Photo Library
Tahquamenon Falls In Winter #3
Jim West/science Photo Library
Tannic Acid Crystals #4
Marek Mis
Walnut Tree Trunk
Dr Keith Wheeler/science Photo Library
Rose Wine
Karl Gaff / Science Photo Library
Tannic Acid Crystals #2
Marek Mis
Tannic Acid Crystals
Marek Mis
Tannic Acid Crystals #1
Marek Mis
Tahquamenon Falls In Winter
Jim West/science Photo Library
Household Acidic Products
Science Photo Library
Oak Artichoke Gall
Geoff Kidd/science Photo Library
Sulphites In Wine
Sheila Terry
Betel Nut Slices
Geoff Kidd/science Photo Library
Betel Nut Slices #1
Geoff Kidd/science Photo Library
Tannic Acid Molecule
Molekuul/science Photo Library
Gallic Acid Molecule #1
Molekuul/science Photo Library
Pomegranates
Sheila Terry/science Photo Library
Eucalyptus Kino Exudate
Dr Jeremy Burgess/science Photo Library
Container Of The Food Additive E181
Wladimir Bulgar/science Photo Library
Tannic Acid Molecule #1
Molekuul/science Photo Library
Amazon River #1
Tony Camacho/science Photo Library
Tannic Acid Molecule
Molekuul
Gallic Acid Molecule
Molekuul
Pellitory Of The Wall
Bruno Petriglia/science Photo Library
Gallic Acid Molecule
Molekuul/science Photo Library
Tannic Acid Molecule #2
Molekuul/science Photo Library
Gallic Acid Molecule #2
Molekuul/science Photo Library
Gallic Acid Molecule #3
Molekuul/science Photo Library
Tannic Acid Molecule #3
Molekuul/science Photo Library
Mangrove Tree In Swamp Off Venezuela
Dr Morley Read/science Photo Library
Betel Nut Slices #2
Geoff Kidd/science Photo Library