A method for determining hydration of a polymer includes mixing a water-soluble, powdered dye with a powdered polymer and introducing the mixed water-soluble, powdered dye and powdered polymer into a water-based fluid. Full hydration of the powdered polymer is determined when the mixed water-soluble, powdered dye, powdered polymer and water-based fluid comprises substantially no internal optical contrast.

A coloring composition includes a colorant, a radically polymerizable compound, a photo-radical polymerization initiator, and a thermal-radical polymerization initiator, in which the thermal-radical polymerization initiator includes at least one selected from a pinacol compound or an -hydroxyacetophenone compound.

An optical filter is provided with a structure that contains a green coloring matter and a black coloring matter and satisfies the following requirements (i) and (ii). Further a device is provided with such an optical filter. (i) An average transmittance of light in the wavelength range of 400 to 730 nm is 2% or less. (ii) A continuous 50 nm wavelength range where an average transmittance is 80% or more exists in the wavelength range of 800 to 1000 nm.

Disclosed are a core-shell type nanosilica fluorescent probe and a synthesis method thereof, wherein the core-shell type nanosilica fluorescent probe is a nanoparticle with a core-shell structure. Also disclosed is a method using the core-shell type nanosilica fluorescent probe for selection of functional microorganisms having toxic aromatic hydrocarbon degrading activity, wherein the method enables efficient, intuitive and rapid specificity sorting and analyzing of individual cells with high sensitively.

The present invention relates to a perylene bisimide compound of formula (I)

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or a mixture thereof. The present invention also relates to the use of the compound in color converters, to the color converters and their use, and to lighting devices containing at least one LED and at least one of the color converters. The present invention also relates to a printing ink formulation for security printing containing at least one of the phenoxy-substituted perylene bisimide compounds.

Microlaser based dye doped polymeric resonators are provided as well as pharmaceutical formulations containing the microlaser based dye doped polymeric resonators, methods of making thereof, and methods of use thereof for monitoring and/or stimulating electrical activity in a brain of a subject in need thereof. The microlaser based dye doped polymeric resonators can include a particle having a spherical core containing one or more fluorescent dyes dispersed within a polymer matrix, wherein the polymer matrix has an index of refraction of about 1.2 or greater; an outer surface surrounding the spherical core; and a gold nanoparticle, wherein the gold nanoparticle is on the outer surface, is dispersed within the spherical core, or both. The fluorescent dyes can include a voltage sensitive fluorescent dye.

The present specification relates to a method for preparing a colorant composition comprising dissolving a first xanthene-based dye having the same number of positive charges and negative charges and a second xanthene-based dye having more negative charges than positive charges by one or more in a first solvent; and precipitating the dissolved first xanthene-based dye and the dissolved second xanthene-based dye in a second solvent, and a colorant composition, a colorant dispersion, a photosensitive resin composition, a color filter and a liquid crystal display device.

A dry pigment paint system includes dry pigment doses that may be used alone or combined with other dry pigment doses to provide a desired color when dispersed in a paint base. The system may use a plurality of dry pigment formulations, with each dry pigment formulation consisting of one or more dry pigments, generally a plurality of dry pigments. Each dry pigment dose may include a single dry pigment formulation. Each does may be a tablet, capsule or sachet. Various dose forms and dispensing systems are disclosed. Formulations of easily dispersible (ED) pigments comprising a combination of a carboxylic acid polymer and a non-ionic alkoxylated surfactant are also disclosed. The combination is used in the formulation of a plurality of pigments. The formulations are suitable for mixing with a base medium at the point-of-sale (PoS) or by the end user.

Compositions and methods related to polymeric materials with thermochromic pigments are generally described.

Provided is a quinacridone pigment composition for coloring plastics, particularly engineering plastics. The quinacridone pigment composition has high transparency and high color strength and also has high heat resistance, so that discoloration during molding of a resin (a color change of a molded plate) is very small. Also provided are a masterbatch and a resin molded product that contain the pigment composition. The pigment composition for coloring resins contains a quinacridone pigment and a pigment that absorbs fluorescence in a wavelength range of 500 to 600 nm. The inventors have found that, when the pigment composition is used as a colorant of a resin molded product subjected to a high-temperature thermal history, the change in color, i.e., the discoloration, of the resin molded product obtained is very small. Thus, the present invention has been completed.