Patent ID: 9617441
Date: 2017-04-11
CPC Classifications: B41J,C09D

Claim:
1. An ink set comprising at least four types of coloring inks comprising a yellow ink, a magenta ink, a cyan ink and a black ink each of which comprises at least water, a surfactant and a coloring agent, wherein, when contents of the surfactant in total masses of the yellow ink, the magenta ink, the cyan ink and the black ink are respectively represented as S1, S2, S3 and S4: S1 satisfies 1.0 mass %≦S1≦2.5 mass %; S1−S2 which is a value obtained by subtracting S2 from S1 satisfies 0.1 mass %≦S1−S2≦0.8 mass %; S3−S2 which is a value obtained by subtracting S2 from S3 satisfies 0.0 mass %≦S3−S2≦0.5 mass %; S3−S4 which is a value obtained by subtracting S4 from S3 satisfies 0.2 mass %≦S3−S4≦1.2 mass %; and S3 and S4 are at least 0.1 mass %.