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Coloskin~A liquid bandage grown by consumers that does not require a hot tie.~<<Japanese traditional


Liquid bandage Coloskin

Birth of liquid bandage Coloskin

The mystery of Coroskin's birth has not yet been clarified. This is because of the opacity of the birth of Tokyo Koshi, which is currently being manufactured.


The history of the company's birth is as follows, citing fragmentary events.

・ In 1924, in the year of Koshi, Nakanishi Take Shoten, a wholesaler in Tokyo, and several manufacturers formed a fellowship and was named "Koshikai".


・ In 1945, with the outbreak of the Sino-Japanese War, the military needed a lot of medicines, and the government started to manage and control raw materials with the aim of effective use of limited resources. It is said that it has become a distribution system.


・ In 1945, as the Pacific War broke out and the war intensified, corporate development laws and regulations were enacted with the aim of improving the efficiency of production and distribution of goods. The drug-selling industry (manufacturing industry) had no choice but to comply with this, and mergers between drug-selling business operators were promoted. Four companies including Tanakaen Pharmaceutical Co., Ltd., which was a member of the Koshikai when the corporate maintenance order was issued, gathered here, and Tokyo Koshisha Co., Ltd. was born here in 1943.


・ From 1945, the head office and factory both started operations in Mita 4-chome, Shiba-ku, Tokyo. At the beginning of the merger, 62 items were manufactured (non-designated drugs). Of these 62 items, Coroskin and 2 other items are a great surprise and a pride of our company that we can continue to provide them to the market even now.


We speculated on the birth of the company based on several events, but it is unclear how far the facts were true or whether there were any further twists or turns due to the burning of materials during the war.


The secret behind the name of the liquid adhesive plaster Coloskin

On the other hand, the name "Coroskin", including horizontal letters, was announced as a trademark application in 1934. The designation of the product is in the category of "Class 1 chemicals, drugs and medical aids", but it is unknown whether the product existed at this point and whether the name was registered as a trademark prior to the product. Is Again, now that there are no materials left at hand, it is completely dark regarding birth.


By the way, the origin of the name "Coloskin" is interpreted as "collodion film". If this interpretation is correct, it is suitable for the current form of Coroskin and the purpose of use.

Moreover, if the trademark is registered with this meaning, it is considered that the product existed around 1945.


In addition, there is an internal opinion that sterilizing and disinfecting agents may be the starting point, saying that "killing bacteria" is the etymology. In any case, there is no document on the prescription at the time of the birth of Coroskin, so it is beyond imagination.


The ingredients of Coroskin at that time were ethyl acetate, castor oil, camphor, alcohol, extravitalized cotton, and fusel acetate. There were more items than at present, and frost damage and cracks were also indicated. This is the oldest document we have about the prescription of Coroskin, and it can be inferred from this that the theory that the name "Coroskin" is derived from "Colodion" is more convincing.


・ On May 25, 1945, the head office and factory in Shiba Ward were destroyed by fire in the Pacific War in Tokyo, and moved to Kitashinagawa 4-chome, Shinagawa Ward. Forty-four of the items at the time of the merger were able to continue their business in 1946, with permission obtained from the existing prescriptions and standard prescriptions of the Home Medicine Prescription Arrangement Implementation Guidelines.


・ In 1948, although the turmoil seemed to subside, it was extremely difficult to procure raw materials and materials. For Coroskin, it became difficult to obtain a solvent, and the prescription had to be changed, so the existing solvent was reduced and benzol was additionally prescribed.


・ In April 1950, the head office was relocated to 2-chome, Kanda Hatago-cho, Chiyoda-ku.


・ In 1952, homosulfamine was additionally prescribed to enhance the medicinal properties of Coroskin. At that time, the Special Sale Commercial Code was an annual event, and it is interesting that the special sale guide (Document-1) of this year also clearly states the content (amount) of the prize. The product (Document-2) contained 7 grams and the selling price was 40 yen.


・ In 1957 and 1936, some changes were made to the prescription ingredients and quantity, and in 1990, the names of the ingredients were changed (such as changing the name of nitrified cotton to pyroxylin), and the indications were sorted out. It became -3).


・ After that, the factory moved to Tanashi City in 1958, and then moved to Nirasaki City, Yamanashi Prefecture in 1986.


・ The head office was relocated to the current 3-chome, Iwamotocho, Chiyoda-ku in 1981.


It has been 60 years since the first Coroskin and 40 years with the current prescription, but it has not yet reached the point of complete consumer satisfaction. Several problems have been raised, including skin irritation during use and solvent odor.


The high molecular weight pyroxylline solubilizer is limited, and it is difficult to remove irritation and odor as it is, and it is necessary to consider from the material of the coating film.


Regarding the film, we have conducted physical property tests (tensile strength test, peeling test, etc.) to discover new materials and to investigate the properties of the film in collaboration with university laboratories.


Observation of the Coroskin coating with an electron microscope at a magnification of more than 10,000 times showed that the surface was extremely smooth and no pores were observed, indicating that microorganisms I μm could not enter. In the future, by researching new materials and understanding the characteristics of the coating, we would like to explore a wider range of other indications from "liquid adhesive plasters" for small areas.


  • When applied to a wound, it immediately forms a thin film to protect the wound from dust and bikin.

  • A liquid adhesive plaster that does not require hotai and does not easily come off even when working with water.



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