Abstract: The purpose of the present invention is to provide a novel anthraquinone compound, and to provide: a dichroic dye constituted of the novel anthraquinone compound; a liquid crystal composition which contains the dichroic dye; and preferably a dimming element having excellent contrast and light resistance and containing said composition. The present invention discloses an anthraquinone compound represented by formula A below (wherein R1 represents a C3-16 branched alkyl group, and R2 represents a hydrogen atom, a C1-8 straight-chain or branched alkyl group, or a C1-8 straight-chain or branched alkoxy group). In addition, the present invention discloses a liquid crystal composition including the anthraquinone compound and a liquid crystal material, and a dimming element containing said composition.

Abstract: A white balance adjustment jig for an endoscope includes: an insertion portion that includes at least one insertion hole into which a distal end part of an endoscope is inserted; a lid portion that is disposed to face the insertion portion; and an outer peripheral portion that is in contact with the insertion portion and the lid portion to form an internal space. The lid portion includes a chart having a plurality of marks on a surface on an insertion portion side, and the chart is inclined with respect to a perpendicular plane perpendicular to the insertion direction of the distal end part.

Abstract: The present invention pertains to: a liquid crystal composition for controlling light that contains, as a dichroic dye, an anthraquinone compound having a specific structure; and a light-controlling element that contains a cured product of said liquid crystal composition for controlling light and exhibits excellent contrast, light-blocking performance, lightfastness, and heat tolerance during current supply. More specifically, the present invention pertains to: a liquid crystal composition for controlling light that contains a compound represented by formula (A) (in the formula. R1 represents a C1-12 alkyl group or a C1-12 alkoxy group, and each R2 independently represents a C1-8 alkyl group), a liquid crystal material, a photocurable compound, and a photoinitiator; and a light-controlling element that is formed by sandwiching a photocured product of said composition between a pair of substrates.

Abstract: An azo compound represented by the following formula (1) or a salt thereof, Wherein A1 represents a naphthyl group which may have a substituent; A2, A3, and A4 each independently represent a phenyl group which may have a substituent or a naphthyl group which may have a substituent; R1 represents a hydrogen atom, a hydroxy group, a C1-4 alkoxy group, or a substituted or unsubstituted amino group; m represents an integer of 0 to 5; M represents a hydrogen atom or ion, a metal ion, or an ammonium ion; n represents 1 or 2; k represents 0 or 1; and each hydrogen atom on ring a and ring b may be substituted with the substituent R1 or substituent SO3M.

Abstract: The purpose of the present invention is to provide: a high performance dye-based polarizing film and dye-based polarizing plate, in particular a neutral gray high performance dye-based film and dye-based polarizing plate, having excellent polarizing performance and moisture resistance, heat resistance and light resistance; and an azo compound or a salt thereof able to produce same. The present invention provides an azo compound represented by formula (1) or a salt thereof.