Used disposable hand warmers offered for deodorizing and dehumidifying purposes. The star of deodorization: "Physical adsorption" of activated carbon Activated carbon is a type of charcoal made by heating wood, coconut shells, etc. at high temperatures. The reason it prevents odors lies in its amazing structure. • Countless holes (pores): The surface of activated carbon is covered with extremely small holes on the nanometer scale (one millionth of a millimeter). • Huge surface area: Thanks to these holes, the surface area of just 1g of activated carbon is said to be equivalent to 2 to 4 tennis courts (about 500 to 1500㎡). • Adsorption mechanism: When odor molecules in the air enter these holes, they are adsorbed tightly to the inner walls of the holes by the attractive force of intermolecular forces (van der Waals force). Why is the activated carbon in "hand warmers" effective? Activated carbon is also used in commercially available deodorizers, but hand warmers have unique advantages. 1. "Dry state" after the reaction is complete: Used hand warmers have consumed the internal moisture through the reaction and are moderately dried by ingredients such as vermiculite. This state is an excellent condition for absorbing moisture and odors from the air. 2. Combination with iron powder: When the iron powder contained in hand warmers oxidizes (rusts), the surface becomes uneven. This "rusted iron powder" itself, although slightly, can help capture odor components. Usage is as follows: ・Shoe boxes ・Entrance shoe storage ・Closets ・Around trash cans ・Inside cars Can be reused for odor control and moisture control. Although they no longer generate heat, because they have a property of absorbing moisture, many people use them as a substitute for commercially available deodorizers. ※ As a purchase bonus, one free sticker with the kanji "緑" (green) in a stamp-like design will be presented. Please let us know via the transaction message if you do not need it. Stickers only are also available, so please feel free to inquire!