Abstract: A chemical fluid for underground injection includes an inorganic substance, an antioxidant (e.g. ascorbic acid, gluconic acid, or a salt thereof, or ?-acetyl-?-butyrolactone, or bisulfite, or disulfite), and water. The inorganic substance may be a colloidal particle or a powder. The inorganic substance may be present in the chemical fluid in amounts of 0.001% by mass to 50% by mass based on the total mass of the chemical fluid for underground injection. The antioxidant may be present in the chemical fluid at a ratio of 0.0001 to 2 of the mass of the antioxidant to the mass of the inorganic substance. A surface of the inorganic substance may be coated with a silane compound. The chemical fluid may further include an anionic surfactant, a cationic surfactant, an amphoteric surfactant, a nonionic surfactant, or a mixture thereof.

Abstract: In order to provide a mechanism with which a user can receive a service with less costs if the user receives a print output, an expendable supplies providing method of the present invention manages advertisement information, generates distribution information based on the advertisement information, distributes the distribution information in order to print the same by a print apparatus of the user, updates a print point of the user who has printed the advertisement information in response to print output of the distribution information by the print apparatus of the user, and determines whether or not expendable supplies should be provided for the user according to the print point.