An azo compound which is reduced in the copper ion content and exhibits hue and clarity suitable for ink-jet recording and which can give records having excellent light fastness, water resistance, and moisture proofness, and such ozone resistance as to control the fading and the discoloration; and water-base yellow inks containing the same. A laser alignment tool includes an arcuate front surface having a target pattern of parallel vertical lines. The executing first application calls user interface functions that when executed inside the runtime environment generate a first user interface.