Skin color in Crocodilia (crocodiles and alligators) is very dependent on water quality.
Lysergic acid diethylamide | fatty acid | acid | Lords of Acid | Velvet Acid Christ | sulfuric acid | The Acid House | salicylic acid | Rosmarinic acid | Fatty acid | Vic Acid | The Electric Kool-Aid Acid Test | The Acid House (film) | tannic acid | Sulfonic acid | Stringfellow Acid Pits | Red fuming nitric acid | Omega-3 fatty acid | Nucleic acid sequence | Mosher's acid | lysergic acid diethylamide | humic acid | gallic acid | Ethylenediaminetetraacetic acid | Dipicolinic acid | Acid Western | Acid Rap | Acid | 5-Hydroxyindoleacetic acid | 4-Aminobenzoic acid |
In 1891, Fayette Shaw started a tannery in Rib Lake, which used tannic acid from locally harvested hemlock bark to tan hides from as far away as South America to make leather.