Scratch and sniff
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Scratch and sniff technology generally refers to things that have been treated with a microfragrance coating. When scratched, the coating releases an odor that is normally related to the image displayed under the coating. The technology has been used on a variety of surfaces from stickers to compact discs.
Stickers became common in the late 1970s, and grew into big business for several companies throughout the early and mid-1980s. As the technology evolved to an "acid-free" design[clarification needed] the sticker craze seemed[weasel words] to come to a close.
Samples of scratch and sniff stickers are used for detection of individual anosmia, although this practice declined after the end of the Cold War.
Utility companies have enclosed scratch and sniff cards in their bills to educate the public inrecognizing the smell of a methane gas leak. However, this would sometimes lead to a rash of false alarms as the scent emanating from a discarded scratch and sniff is later mistaken for a real gas leak.
Scratch and sniff is created through the process of micro-encapsulation. The desired smell is surrounded by micro-capsules that break easily when gently rubbed. The rub to release action breaks the micro-encapsulated bubbles and releases the aroma. Because of the micro-encapsulation, the aroma can be preserved for extremely long periods of time.
While there were hundreds of companies that put out Scratch and Sniff stickers, the most well known are the originators Creative Teaching Press (CTP) (who later renamed them Sniffy's in 1980/1981), Trend Enterprise's Stinky Stickers line (which followed directly after CTP), Hallmark, Sandylion, Spindex, Gordy, and Mello Smello.
More recently the BBC reinvented Scratch and Sniff cards with a version that accompanied a new television series 'Filthy Cities'. Viewers were invited to use the aroma cards at home to experience the nasty smells of Medieval London and Revolutionary Paris as they were taken on a journey back in time to the 'filthy cities' of yesteryear. The four aromas included Sewage, 18th Century Tannery, Marie Antoinettes Perfume and Pong de Paris. The fragrances and scratch and sniff cards were developed by The Aroma Company Europe in Oxfordshire using aroma touch to smell technology.
Scratch and sniff in popular culture 
Apart from the stickers, scratch and sniff surfaces are to be found on some objects in popular culture:
- Gran Turismo 2 and FIFA 2001 featured a scratch and sniff disc.
- The vinyl cover of Dandelion Gum, an album by Black Moth Super Rainbow, has a scratch and sniff surface.
- The Player's Guide for the 1995 Super Nintendo video game EarthBound included six scratch and sniff cards. One contained a mystery scent; if the player guessed the smell and sent in the card to Nintendo, they would receive a prize. The scent turned out to be pizza.
- The 1981 movie Polyester, directed, produced, and written by John Waters, was released featuring a gimmick called "Odorama", whereby viewers could smell what they saw on screen through scratch and sniff cards. The Odorama gimmick was also used for the 2009 Sydney Underground Film Festival screening of Water's 1972 cult classic Pink Flamingos. Several other movies had used this idea, such as Rugrats Go Wild and Spy Kids: All the Time in the World, the latter you had to rub instead of scratch. In 2011 Midnight Movies reproduced Polyster 'Odorama' for the Edinburgh Film Festival using replica scratch and sniff cards with the original 10 aromas used in the 1981 movie.
- The band Mae released a limited edition CD during their US tour with a scratch and sniff surface. It was scented like the ocean and the crowd was encouraged to smell the discs during their song "The Ocean".
- Katy Perry made her album Teenage Dream [Deluxe Edition] smell like cotton candy through scratch and sniff technology.
- In the Pushing Daisies episode "The Smell of Success", olfactory scientist Napoleon LeNez has written a scratch and sniff book for using odours to bring success in the life of the reader. The protagonists investigate a murderous attempt to sabotage his book launch.