adhesive stays with the backing and is easily removed. Paper backings without wet strength may release their adhesives, potentially contaminating recycling efforts. Labels can aid in recycling and reuse by communicating the material content of the item, instructions for disassembly or recycling directions. An eco-label is used on consumer products (including foods) to identify products that may be less damaging to the environment and/or humans than other related products, such as sustainable seafood encouraged by Friend of the Sea. Other aspects Color Ink and base stock color choices commonly conform to the Pantone Matching System (PMS) colors. The Pantone system is very dominant in the label printing industry. Additionally, specialty inks such as metallic, UV ink, magnetic ink, and more are available. Ink is usually transparent however it can be made opaque. It has been known for certain companies to patent "their own" color. Digital labels use process colors to replicate Pantone solid colors. Collectability Collecting labels is a worldwide phenomenon, from labels used on matchboxes and foodstuffs (e.g., cheese), wine, to printed packages. Collectors are attracted to labels both for their influence on artistic design and the history of retailing. See also Nameplate Head badge Packaging and labeling Pressure-sensitive tape Sticker Swing tag Vehicle registration plate References Further reading Fairley M, "Encyclopedia of Label Technology". 2nd Edition, Tarsus Publishing, 2014,, Holkham, T., "Label Writing and Planning – A guide to good customer communication", Chapman & Hall 1995, Yam, K. L., "Encyclopedia of Packaging Technology", John Wiley & Sons, 2009, ASTM D7932 Standard Specification for Printed, Pressure-Sensitive Adhesive Labels for Use in Extreme Distribution Environments External links Boston Public Library, USA. Produce Crate Labels, ca. pre-1950s Stationery Packaging materials Advertising sv:Klistermärke