The Valley Trail 3-Pack of Adirondack Alcohol Inks by Ranger Ink adds vibrant color to a variety of non-porous materials. These acid-free inks are fast-drying, transparent and permanent. Use them on slick materials, such as glass, plastic, foil, metal, glossy paper and more. The bottles have precisions tips. This set includes Raspberry, Pebble and Clover. These inks are recommended by Tim Holtz.