An optical sheet 10 of the present invention includes a laminate including a polarizing layer 4 containing at least one kind of a light absorbing agent and having a polarizing function, and a protective layer 1 laminated on the polarizing layer 4, in which in the polarizing layer 4, a value of a* is 0 or more and 30 or less and a value of b* is 0 or more and 30 or less in an L*a*b* color system defined by JIS Z 8781-4, and in the optical sheet 10, a size of a Q Blue value defined by Australian Standard Australia/New Zealand Standard 1067-2016 is 0.70 or more. Thus, even when the optical sheet is toned to brown, blue light can be distinguished with excellent distinguishability.

An optical sheet 10 of the present invention includes a laminate including a polarizing layer 4 containing at least one kind of a light absorbing agent and having a polarizing function, and a protective layer 1 laminated on the polarizing layer 4, in which in the polarizing layer 4, a value of a* is 0 or more and 30 or less and a value of b* is 0 or more and 30 or less in an L*a*b* color system defined by JIS Z 8781-4, and in the optical sheet 10, a size of a Q Blue value defined by Australian Standard Australia/New Zealand Standard 1067-2016 is 0.70 or more. Thus, even when the optical sheet is toned to brown, blue light can be distinguished with excellent distinguishability.

A pigment composition contains: an azo pigment that is a reaction product between a coupler and a base; and a pigment derivative, and a content of o-anisidine derived from the coupler is less than or equal to 20 mg/kg in the entire pigment composition. A method for producing the pigment composition includes, after reaction between a coupler and a base to generate an azo pigment, or during the reaction between the coupler and the base, adding a remover for o-anisidine derived from the coupler.

In one aspect the present disclosure relates to an aqueous inkjet ink composition comprising a yellow azo pigment, a pigment synergist, a polymeric dispersant, 5 to 20 wt % of a latex polymer, 5 to 40 wt % of an organic co-solvent that has a boiling point of a boiling point in the range of about 170° C. to about 285° C., and water. The pigment synergist comprises a pigment of the formula (I): ##STR00001##
where each of R.sub.1 to R.sub.10 is each independently selected from H, carboxylate, and/or a sulphonate group.

An azo pigment is provided which can be used as a coloring agent, etc. for use in paints, plastics, synthetic fibers, printing inks, and writing materials or for image recording or image displaying and which has performance of exhibiting high near infrared reflection/transparency, particularly when used as a heat-shielding paint, even in the case where the pigment has a dark color, and as a result, colored articles having the above-described properties are provided, and furthermore an article that is also useful as a printing ink in the security field is provided particularly when the pigment has a dark or black color. Specifically, an azo pigment is provided which is obtained through coupling reaction between a particular azo component and a particular coupling component, which has a plurality of chromophores of an azomethine group and of an azo group within a molecule, and in which the diazo component is a diazotized product of 3-(4-aminophenylimino)-1-oxo-4,5,6,7-tetrachroloisoindoline.

A coloring composition includes Color Index Pigment Red 264, a graft resin having an acid group, a photopolymerizable compound, and a photopolymerization initiator.

A coloring composition includes Color Index Pigment Red 264, a graft resin having an acid group, a photopolymerizable compound, and a photopolymerization initiator.

A yellow toner which provides, even in small amounts, a sharper color and brighter gloss, and higher reflection density than ever before, and which has excellent light resistance. The yellow toner contains a binder resin and a yellow colorant, wherein, as the yellow colorant, at least one of the compound A represented by the following general formula (1) and the compound B represented by the following general formula (2), and the compound C represented by the following formula (3) are contained: ##STR00001##

A yellow toner which provides, even in small amounts, a sharper color and brighter gloss, and higher reflection density than ever before, and which has excellent light resistance. The yellow toner contains a binder resin and a yellow colorant, wherein, as the yellow colorant, at least one of the compound A represented by the following general formula (1) and the compound B represented by the following general formula (2), and the compound C represented by the following formula (3) are contained:

##STR00001##

The present invention relates to [1] a process for producing a pigment composition, including the step of subjecting a raw material pigment composition containing PY74 and a specific by-product to a treatment with an oxidizing agent, in which a content of the specific by-product in the pigment composition after the treatment on the basis of a content of PY74 in the pigment composition after the treatment is not more than 1,200 mg/kg; [2] a process for producing a pigment composition, including the step of subjecting a raw material pigment composition containing PY74, a specific by-product and water to a treatment with hydrogen peroxide; [3] a method of reducing a content of a specific by-product in a raw material pigment composition containing PY74 and the specific by-product, said method including the step of subjecting the raw material pigment composition to a treatment with an oxidizing agent; and [4] a method of preventing an ink for ink-jet printing from suffering from ejection defects, including the step of compounding the pigment composition produced by any of the aforementioned processes in the ink for ink-jet printing.