Patent ID: 7419233

Claim:
An ink cartridge set for an ink-jet recording apparatus, comprising: a first ink cartridge which includes a first ink tank that contains a light-transmissive ink, and a nontransparent member arranged in the first ink tank so that the nontransparent member is movable depending on a residual amount of the ink, the first ink tank having a first light-transmissive area across which the nontransparent member passes; and a second ink cartridge which includes a second ink tank that contains a nontransparent ink, which is formed with a second light-transmissive area, and which includes no nontransparent member, wherein the first and second light-transmissive areas are provided at first and second projections which protrude from side surfaces of the first and second ink tanks respectively, and wherein the first and second projections have internal spaces thereof which are communicated with internal spaces of the first and second ink tanks respectively.