When used with the Puracycle labels, the ink will stay on through steam, condensation, freezing water and boiling water so can be stored anywhere The ink is permanent on standard paper The markers have not been tested on animals, making them vegan-friendly The ink is easy to remove when you apply friction and water, great for re-labeling The ink is non-toxic and odourless, so won't taint yor ingredients The markers have not been tested on animals, making them vegan-friendly