An electrolytic dye reduction method comprises preparing a catholyte by dispersing a dye in a leucodye comprising electrolyte. In a preferred method the leucodye like leucoindigo is the sole dispersing aid.

The present invention relates to a modified colorant comprising a colorant having at least one polymer attached or adsorbed thereto. The polymer comprises at least one functional group, and various embodiments of the functional group are disclosed. For each of these embodiments, preferably the functional group has a defined calcium index value. Also disclosed are various uses for these modified colorants, including inkjet ink compositions. Thus, the present invention further relates to an inkjet ink composition comprising a) a liquid vehicle, b) at least one colorant, and c) at least one polymer comprising at least one functional group as described herein.

A curable composition includes: a near infrared absorbing compound that includes a cation having an absorption in a near infrared range and an anion; a salt of an anion that is a component other than the near infrared absorbing compound and has a conjugate acid pKa of −8 or lower; and a curable compound.

A compound comprises at least one fluorescent moiety covalently bound to at least one second moiety selected from the group consisting of leuco moieties and chromophore moieties.

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

A dyeing method includes immersing a fiber into a dye for dyeing the fiber, in which the dye includes indigo and indirubin, and the indigo and the indirubin have a weight ratio of 20:1 to 80:1. The indigo in the dye has a concentration of 0.1% o.w.f. to 5% o.w.f. The dyed fiber may simultaneously have high luminance, high color saturation, high strength of colorization, and sufficient colorfastness.

A composition includes a pigment, a pigment derivative which has at least one group selected from the group consisting of groups represented Formula (2): -L-NH—R.sup.2, and the like, a dispersant which has a constitutional unit having an adsorbing group and a constitutional unit having a steric repulsive group, and is a random copolymer or an alternating copolymer, and a solvent. In Formula (2), L represents —CO—, —SO.sub.2—, or —PO(R.sup.21)—, R.sup.21 represents a hydrogen atom or a monovalent organic group having 1 or more carbon atoms, R.sup.2 represents —COR.sup.22, —SO.sub.2R.sup.22, or —PO(R.sup.22).sub.2, and R.sup.22's each independently represent a hydrogen atom or a monovalent organic group having 1 or more carbon atoms.

Fluorescence titration of methylene blue, rhodamine B and rhodamine 6G (R6G) by silver nanoparticle (AgNP) all resulted in an initial steep quenching curve followed with a sharp turn and a much flatter quenching curve. At the turn, there are about 200,000 dye molecules per a single AgNP, signifying self-assembly of approximately 36 layers of dye molecules on the surface of the AgNP to form a micelle-like structure. These fluorescence-quenching curves fit to a mathematical model with an exponential term due to molecular self-assembly on a AgNP surface, or “self-assembly shielding effect”, and a Stern-Volmer term (nanoparticle surface enhanced quenching). Such a “super-quenching” by AgNP can only be attributed to “pre-concentration” of the dye molecules on the nanoparticle surface that yields the formation of micelle-like self-assembly, resulting in great fluorescence quenching. Overall, the fluorescence quenching titration reveals three different types of interactions of dye molecules on AgNP surface: 1) self-assembly (methylene blue, rhodamine B and R6G), 2) absorption/tight interaction (tryptamine and fluorescein), and 3) loose interaction (eosin Y). We attribute the formation of micelle-like self-assembly of these three dye molecules on AgNP to their positive charge, possession of nitrogen atoms, and with relatively large and flat aromatic moieties.

Provided are a coloring composition capable of producing a film having excellent light fastness, and the like, a method for producing a coloring composition, a color filter, a pattern forming method, a solid-state imaging device, and an image display device. The coloring composition includes a coated pigment in which at least a portion of a surface of a yellow pigment is coated with a resin, a halogenated phthalocyanine pigment, a dispersant having an acid value of 40 mgKOH/g or more, and a curable compound.

A scented color-changing system for revealing a hidden message, brand, picture, and the like on a substrate such as a paper when a fragrance is applied or released on the substrate. The hidden message contains a color former such as a leuco dye and the fragrance contains a color developer such as zinc chloride that reacts with the color former to reveal the message. The fragrance can be sprayed on the substrate or released from microcapsules embedded in or disposed on the substrate by rupturing the microcapsules. The scented color-changing system is particularly suited for use with fragrance test strips, advertising mailers, magazine inserts, and the like.