| abstract |
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 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. |