Patent ID: 7284815

Claim:
An inkjet recording apparatus, comprising: a light emitting device which illuminates an inkjet recording ink with light, the inkjet recording ink being filled in at least one of an ink supply tank made at least partially of a transparent material, and a line provided between an ink supply tank and an inkjet head, the line being made at least partially of a transparent material; a measuring device which measures a spectral characteristic of one of the light transmitted through the inkjet recording ink and the light reflected by the inkjet recording ink, the measuring device measuring, in a plurality of wavelengths, luminous energy of light transmitted through the inkjet recording ink and/or light reflected by the inkjet recording ink, for inkjet recording ink of one color; and a determining device which determines whether the inkjet recording ink is the specific ink according to the luminous energy in the plurality of wavelengths measured by the measuring device, and the spectral characteristic of the specific ink, the determining device being capable of determining at least whether the inkjet recording ink is an ink which has a color similar to the specific ink and has a composition different from a composition of the specific ink.