Abstract: An ink composition contains dyes A and B. Dye A has a width at a half height of the largest peak in the absorption spectrum between 380 nm and 780 nm that is 50 nm or less. Dye B has a corresponding width at the half height that is 70 nm or more. Dye A is present in an amount of 40% by mass or more and 90% by mass or less of the total mass of the dyes.

Abstract: An ink jet recording ink set of this invention is an ink jet recording ink set containing a dye ink and a pigment ink, in which the dye ink contains a dye in a proportion of 1.4% by mass or more and 5.0% by mass or less based on the total mass of the ink, the pigment ink contains a pigment in a proportion of 4.0% by mass or more and 8.0% by mass or less based on the total mass of the ink, and, when the volume average particle diameter of the pigment ink is defined as ?1 and the volume average particle diameter of a mixed liquid in which the dye ink and the pigment ink are mixed in equal amounts in terms of the mass ratio is defined as ?2, the following expression (1) is satisfied, 1.00??2/?1?1.40??(1).

Abstract: An ink jet recording ink set of this invention is an ink jet recording ink set containing a dye ink and a pigment ink, in which the dye ink contains a dye in a proportion of 1.4% by mass or more and 5.0% by mass or less based on the total mass of the ink, the pigment ink contains a pigment in a proportion of 4.0% by mass or more and 8.0% by mass or less based on the total mass of the ink, and, when the volume average particle diameter of the pigment ink is defined as ?1 and the volume average particle diameter of a mixed liquid in which the dye ink and the pigment ink are mixed in equal amounts in terms of the mass ratio is defined as ?2, the following expression (1) is satisfied, 1.00??2/?1?1.40 ??(1).

Abstract: An ink composition contains dyes A and B. Dye A has a width at a half height of the largest peak in the absorption spectrum between 380 nm and 780 nm that is 50 nm or less. Dye B has a corresponding width at the half height that is 70 nm or more. Dye A is present in an amount of 40% by mass or more and 90% by mass or less of the total mass of the dyes.

Abstract: A pattern sheet, an insulation sheet and a frame made of sheet metal are successively built up on a plate made of sheet metal, a pair of links pivotally connected together intermediate their opposite ends to form a pantograph mechanism are movably engaged at their one ends with respective bearings formed on the frame by a drawing process while the other ends of the links are movably engaged with respective bearings formed on the bottom surface of a key top.

Abstract: A method of printing characters on key tops made of a resin comprises the steps of printing character patterns on the key tops using an ink obtained by adding a coloring agent to a multifunctional acrylic ultraviolet-ray-curable paint and subsequently hardening the printed ink character patterns by irradiating the printed surface of each key top with ultraviolet rays.