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scratch and sniff
Scratch and sniff technology generally refers to stickers or cardboard items that have been treated with a fragrant 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.
==Use==
Scratch-and-sniff stickers became popular in the late 1970s, and remained so through to the mid-1980s. In 1977, Creative Teaching Press produced some of the earliest scratch and sniff stickers. These stickers were mainly marketed to teachers as rewards for their students.〔http://www.bubbledog.com/sns/ctp.html〕
For a time, scratch-and-sniff stickers were used to diagnose anosmia, although this practice later declined.
Utility companies have enclosed scratch and sniff cards in their bills to educate the public in recognizing the smell of a methane gas leak. In 1987, cards distributed by the Baltimore Gas and Electric Company led to a rash of false alarms when the scents of cards in unopened envelopes were mistaken for real gas leaks.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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