The purpose of the present invention is to provide a pigment composition having outstanding dispersion characteristics, weather resistance, and heat resistance, has favorable storage stability, minimizes fading over time in a basic atmosphere, and contains isoindoline compounds.

The pigment composition contains the isoindoline compound represented by formula (1) below and the isoindoline compound represented by formula (2) below.

##STR00001## [in the formula, R.sub.1 to R.sub.4 represent hydrogen atoms, R.sub.5 and R.sub.6 each independently represent alkyl groups, and A and A′ represent a group represented by formula (3) below, formula (4) below, or formula (5) below,

##STR00002## In the formula, X represents —O— or —NH—, R.sub.7 represents an alkyl group or an aryl group, and R.sub.8 to R.sub.14 each independently represent hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, aryl groups, aryloxy groups, thioalkyl groups, or thioaryl groups.]

[Problems] To provide a reversibly thermochromic composition having excellent contrast between a colored state and a decolored state, and excellent light resistance, and a reversibly thermochromic microcapsule pigment encapsulating the reversibly thermochromic composition.

[Solution] Disclosed is a reversibly thermochromic composition including: (a) an electron-donating color-developing organic compound; (b) a combination of a compound having a specific structure as an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the reversibly thermochromic composition.

An optical filter includes: a transparent substrate; and an absorption layer on the transparent substrate, the absorption layer containing at least one dye (X) having a maximum absorption wavelength in 600 to 1000 nm. A laminate of the transparent substrate and the absorption layer satisfies all of the following characteristics (i-2) to (i-4): (i-2) a maximum internal transmittance in 700 to 850 nm is 35% or lower; (i-3) a difference between the maximum internal transmittance and a minimum internal transmittance in 700 to 850 nm is 20% or smaller; and (i-4) OD(A) and OD(B) satisfy the following relationship: OD(A)/OD(B)<0.07 where OD(A) is an average optical density of an internal transmittance in 500 to 600 nm and OD(B) is an average optical density of an internal transmittance in 700 to 850 nm.

Provided herein are color charts and water color pigment solutions useful, for example, in the calibration of reflectance-based diagnostic analyzers.

The present invention relates to a method for producing test pieces in which the thickness of the samples of homogeneous water-insoluble material is uniform, and to a method for quantitative analysis of water-insoluble material by analyzing such test pieces using MALDI mass spectrometry. Specifically, the test pieces can be produced by: adding a volatile solvent to a mixture of water-insoluble material and matrix; placing, in a pellet cup made of water-soluble material, and pressing, with even pressure, the sample obtained by mixing the mixture of water-insoluble material and matrix until the solvent has evaporated; and melting the pellet cup with water.

The invention discloses a special-purpose reactive disperse dye for waterless dyeing of natural fibers in supercritical CO.sub.2 fluid and an intermediate thereof. The reactive disperse dye has a longer alkane-chain bridging group between a chromophoric parent structure and an active group of the dye, which effectively promotes the donating-withdrawing effect on the electron cloud in the conjugated system, enhances the hyperchromic effect, effectively reduce the influence of the active group itself and its reaction on the dye coloring system, improves the color and stability against acid and alkali of the dye, and facilitate the improvement of the compatibility of the dye with supercritical fluid and the dyeing performance for natural fibers as well. The invention also discloses an intermediate of the reactive disperse dye, and a method for preparing the reactive disperse dye.

Provided are an ink for a PTP package, which is a counterfeit prevention ink for use in a PTP package, has excellent invisibility, can be efficiently read by a scanner having sensitivity in a near infrared region, is highly durable, and can be used for a material of a PTP package, particularly an aluminum substrate; and an ink composition for use therefor. An ink composition for a PTP package, containing vanadyl naphthalocyanine represented by Formula (I):

##STR00001## and a resin. The resin is preferably at least one selected from a cellulose-based resin, a vinyl-based resin, a polyamide-based resin, a polyimide-based resin, an epoxy-based resin, a polyurethane-based resin, a polyester-based resin, a polyester urethane-based resin, a polystyrene-based resin, a polyolefin-based resin, a polyacrylic resin, and a polycarbonate-based resin.

A thickness-detecting bond primer is disclosed. In various embodiments, the thickness-detecting bond primer includes a solvent configured for application to a metallic surface; and a dye dispersed within the solvent, the dye having a concentration within a range of about 0.001 weight percent to about 5.0 weight percent of the thickness-detecting bond primer.

Provided are a coloring composition including a pigment, a pigment derivative, and a resin, in which an average primary particle diameter of the pigment is 70 nm or less, and an average primary particle diameter of the pigment derivative is more than 70 nm; a film formed of a coloring composition; a color filter; a method for manufacturing a color filter; a solid-state imaging element; and an image display device.

Provided herein are color charts and water color pigment solutions useful, for example, in the calibration of reflectance-based diagnostic analyzers.