scratch and sniff

{{Short description|Odor technology}}

{{about||the radio show|Skratch 'N Sniff|the 1990 album by Fate|Scratch 'n' Sniff}}

Scratch and sniff technology is the application of a fragrant coating to items such as stickers or paperboard, so that when the coating is scratched it 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. Gale W. Matson accidentally invented the technology while working for 3M in the 1960s. He was attempting to create a new method for making carbonless copy paper using microencapsulation.{{cite web|last1=Soniak|first1=Matt|title=How Does Scratch and Sniff Work?|url=http://mentalfloss.com/article/20825/how-does-scratch-and-sniff-work|website=Mental Floss|date=9 February 2009|accessdate=June 29, 2016}} The technology to infuse microcapsules and paper was submitted to the US patent office on November 18, 1969, and the patent was granted on June 23, 1970.{{Cite patent|number=US3516846A|title=Microcapsule-containing paper|gdate=1970-06-23|invent1=Matson|inventor1-first=Gale W.|url=https://patents.google.com/patent/US3516846A/en}} Despite the technology being invented by Matson in the 1960s and its subsequent success in the 1970s, the first patent for a translucent fragrance releasing version of microcapsules wasn't issued until January 15, 1985, to the 3M corporation.{{Cite patent|number=US4493869A|title=Fragrance-releasing microcapsules on a see-through substrate|gdate=1985-01-15|invent1=Sweeny|invent2=Relyea|invent3=Brustad|inventor1-first=Norman P.|inventor2-first=Keith E.|inventor3-first=Wayne L.|url=https://patents.google.com/patent/US4493869A/en/}}

Use

One of the earliest uses of scratch-and-sniff technology can be found in the 1971 children's book "Little Bunny Follows His Nose," which features various smellable objects such as peaches, roses, and pine needles.{{Cite web |title=Little Bunny Follows His Nose |url=https://www.goodreads.com/work/best_book/1116678-little-bunny-follows-his-nose-golden-scratch-sniff-books |access-date=2022-09-11 |website=www.goodreads.com}}{{Cite book |last=Howard |first=Katherine |title=Little Bunny follows his nose |publisher=Golden Books |year=1971}} Stickers and labels 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, primarily marketing them to teachers as rewards for their students.{{Cite web |title=Stickers, Cards and Collectors. – The Scratch and Sniff Company |date=5 June 2017 |url=http://www.scratchandsniff.co/case-studies/stickers-cards-and-collectors/ |access-date=2022-09-11 |language=en}}{{cite web |url=http://www.bubbledog.com/sns/ctp.html |url-status=dead |archive-url=https://web.archive.org/web/20030622225049/http://www.bubbledog.com/sns/ctp.html |archive-date=2003-06-22 |title=BUBBLEDOG'S CTP Scratch 'N Sniff Collection}}

Scratch-and-sniff stickers are occasionally used to help diagnose anosmia,{{Cite journal |date=2022-08-02 |title=Disorders of Taste and Smell: Introduction and Background, Anatomy and Physiology, Etiology of Smell and Taste Disorders |url=https://emedicine.medscape.com/article/861242-overview}}{{Cite web |date=2021-08-08 |title=Smell and Taste Disorders |url=https://www.hopkinsmedicine.org/health/conditions-and-diseases/smell-and-taste-disorders |access-date=2022-09-11 |website=www.hopkinsmedicine.org |language=en}} though the Alcohol Sniff Test, which uses vaporised 70% isopropyl alcohol, is far more common.{{Cite journal |last1=Davidson |first1=T. M. |last2=Murphy |first2=C. |date=June 1997 |title=Rapid clinical evaluation of anosmia. The alcohol sniff test |url=https://pubmed.ncbi.nlm.nih.gov/9193218/ |journal=Archives of Otolaryngology–Head & Neck Surgery |volume=123 |issue=6 |pages=591–594 |doi=10.1001/archotol.1997.01900060033005 |issn=0886-4470 |pmid=9193218}}{{Cite web |date=2018-03-23 |title=Sniff Tests |url=https://www.mopropanesc.org/post/sniff-tests |access-date=2022-09-11 |website=MOPSC |language=en}}

Some utility companies 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.{{cite web|author=AP |url=https://www.nytimes.com/1987/09/06/us/noses-are-out-of-joint-over-baltimore-smell.html |title=Noses Are Out of Joint Over Baltimore Smell - New York Times |work=The New York Times |date=1987-09-06 |accessdate=2014-08-12}}

Production

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.

References

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