Patent ID: 11912882
Assignee: SEIKO EPSON CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. An ink set comprising:
a process color ink set including a yellow ink, a magenta ink, a cyan ink, and a black ink as process color inks; and
a light ink having a color similar to a corresponding one of the process color inks in the process color ink set, wherein
the yellow ink has a maximum absorption wavelength in a range from 350 nm to 480 nm,
the magenta ink has a maximum absorption wavelength in a range from 510 nm to 560 nm,
the cyan ink has a maximum absorption wavelength in a range from 580 nm to 700 nm,
a full width at half maximum of a peak including the maximum absorption wavelength of the yellow ink is in a range from 85 nm to 100 nm,
a full width at half maximum of a peak including the maximum absorption wavelength of the magenta ink is in a range from 85 nm to 100 nm,
a full width at half maximum of a peak including the maximum absorption wavelength of the cyan ink is in a range from 118 nm to 165 nm,
a maximum absorbance in a visible light wavelength range of the light ink is 70% or less of a maximum absorbance in the visible light wavelength range of the corresponding one of the process color inks,
the yellow ink contains a compound represented by the formula (Y-4) or a salt thereof, and
the light ink is a light black ink containing a compound represented by formula (B-1) or a salt thereof in an amount of 0.5% by mass or more relative to a total amount of ink,