Nature and EnvironmentShoe leather free of toxins05:32This browser does not support the video element.Nature and Environment02/21/2016February 21, 2016Tanning shoe leather with barrels full of water and chromium sulfate poses a hazard to tanners, shoe wearers and the environment. Two new alternatives involve tanning in highly pressurized CO2 in special drums and using rhubarb root extract.Copy linkAdvertisement