Abstract: A material to be processed into leather products such as leather and fur characterized in that at least one effective component of an aromatic component, a deodorant component, a drug effective component, an antibacterial component, an anti-mold component, and an insect-controlling component, or a fat or oil component such as a fatliquoring agent is impregnated into tissue and fiber of animal hide or skin using a high pressure fluid as a medium.

Abstract: A novel and efficient electrochemical method is disclosed for the recovery of lithium value from an aqueous solution containing lithium ions in a relatively low concentration together with ions of various kinds of other metallic impurity elements. The method comprises electrochemical selective adsorption of lithium ions from the aqueous solution on to a specific working electrode by applying a DC voltage of a relatively low DC voltage of 0.1-0.4 volt versus a saturated calomel electrode to the working electrode as the cathode opposed to a counterelectrode as the anode and then desorption of the lithium ions therefrom by applying a DC voltage of 0.7-1.2 volts versus a saturated calomel electrode to the lithium-bearing working electrode as the anode opposed to a counterelectrode as the cathode in an aqueous desorption medium containing an electrolyte such as a lithium salt.

Abstract: A highly sensitive and reliable electrochemical method is proposed for the determination of the lithium ion concentration in an aqueous medium, e.g., blood of a patient suffering depression and administrated with a lithium-containing medicament, by measuring the electromotive force between the medium and a powdery non-selective electrode, which is a non-stoichiometric composite oxide of lithium and manganese of the formula Li.sub.x Mn.sub.2 O.sub.4, x being a positive number smaller than 1, prepared by partially leaching lithium ions out of a spinel-type lithium manganate LiMn.sub.2 O.sub.4 with an acid, dipped in the medium. The ion-selective electrode can be in the form of a thin film or coating layer on an electrode element. This film or layer can be formed of a polymeric resin as a binder for the powdery composite oxide.