Patent ID: 7247193
Filing Date: 2007-07-24
Classification: C09D

Abstract:
1. A second ink to be used in combination with a first ink for use in an ink jet recording apparatus having a first opening to which the first ink is supplied, a second opening to which the second ink is supplied, and a cover member with which the first opening and the second opening are covered to form a closed space, the first ink comprising at least water, a water-soluble compound, and a coloring material, and the second ink comprising at least water, a water-soluble compound, and a coloring material, the first ink having a molar fraction of water of N (%) to a water-soluble compound having a molecular weight of 300 or less, in which the second ink has a molar fraction of water that is different from N (%) and is N−5 (%) or more and N+5 (%) or less, and at least one of the first ink and the second ink comprising, as the water-soluble compound, a water-soluble compound having a molecular weight of 70 or less.