The present invention provides a method for preparing a colour-stable preparation of a magnesium chlorophyllin alkali metal salt or alkali earth metal salt from natural sources of chlorophyll. The invention further provides a colour-stable and substantially pure pigment composition comprising a vibrant green magnesium chlorophyllin in the form of an alkali metal or alkali earth metal salt, e.g. those prepared by the methods of the invention, and the use of the salts and compositions of the invention as colouring agents, in particular as food colouring agents, and as medicaments and disinfectants.

The invention relates to a method for preparing high-stability liquid blueberry anthocyanins, belonging to the field of food processing. A method for preparing high-stability liquid blueberry anthocyanins comprises the following process steps: adding graphene oxide and chitosan to an MES buffer solution at room temperature, mixing homogeneously and adding EDC and NHS sequentially, reacting to obtain a first solution; adding dry blueberry anthocyanin powder in the first solution, adjusting pH to 4.5 to 5.0 and mixing homogeneously to obtain a second solution, and treating the second solution at 350 to 420 MPa and 2 to 4? C. to obtain the product. The method for increasing the stability of blueberry anthocyanins provided by the present invention uses dry blueberry anthocyanin powder as a raw material and adds graphene oxide combined with chitosan compound as an anthocyanin stabilizer, thereby increasing the stability of blueberry anthocyanins during processing and production.

The present invention provides a near-infrared transmitting black material that can sufficiently absorb visible light and sufficiently inhibit the absorption of near-infrared light. Provided is a near-infrared transmitting black material containing an oxazine resin.

The present invention provides a black photosensitive composition which has excellent residue suppressibility in a case where a pattern is formed and which makes it possible to form a pattern having excellent adhesiveness with a smaller exposure amount, a production method for a black photosensitive composition, a cured film, a color filter, a light shielding film, an optical element, a solid-state imaging element, and a headlight unit. The black photosensitive composition according to the present invention is a black photosensitive composition containing a black pigment, a resin, a carboxylic acid anhydride, and a polymerizable compound, in which the carboxylic acid anhydride has a molecular weight of 50 to 550, the carboxylic acid anhydride has a content of 0.30% to 10.0% by mass with respect to a total solid content of the black photosensitive composition, and the black pigment has an average particle diameter of 250 nm or less.

A phthalocyanine compound in which the numbers and positions of various types of functional groups can be controlled and which can be produced from a biomass raw material is provided. The phthalocyanine compound has comparable or superior performance to conventional phthalocyanine compounds and can contribute to the carbon neutrality. The phthalocyanine compound is a compound represented by the following formula (I) or the like, the compound containing a radioactive carbon atom .sup.14C.

An object of the present invention is to provide a phycocyanin pigment composition insoluble in water and provide food, cosmetics, a coating material or a printing marker for pharmaceuticals or agricultural chemicals, a stationery product, a writing tool, a printing ink, an inkjet ink, a metal ink, a paint, a plastic coloring agent, a color toner, a fluorescent labeling agent, a fluorescent probe, or a chemical sensor, each containing the pigment composition. It was found that the phycocyanin pigment composition containing phycocyanin and a metal or a metal compound was insoluble in water, and thus the present invention was accomplished.

A method for obtaining an anthocyanin pigment color composition from carrot plants (preferably black carrot plants) comprising pre-harvest foliar spraying of an ethylene-releasing compound and the use of the obtained anthocyanin pigment color composition for coloring of an edible product or a pharmaceutical product.

A method of producing an organic pigment composition including at least organic pigment microparticles, wherein a diffuse reflectance of the organic pigment microparticles is controlled for the purpose of improving a luminance of a color filter. The luminance of the color filter is controlled to be high, by controlling a ratio of an area of the diffuse reflectance in a target wavelength range to a total area of the diffuse reflectance in the entire measurement wavelength range in a diffuse reflection spectrum of the organic pigment microparticles in the wavelength range of 380 to 780 nm, to be high. The luminance of the color filter is controlled to be high, by coating at least a part of the surface of the organic pigment microparticles with an oxide.

The present invention provides a method for preparing a colour-stable preparation of a magnesium chlorophyllin alkali metal salt or alkali earth metal salt from natural sources of chlorophyll. The invention further provides a colour-stable and substantially pure pigment composition comprising a vibrant green magnesium chlorophyllin in the form of an alkali metal or alkali earth metal salt, e.g. those prepared by the methods of the invention, and the use of the salts and compositions of the invention as colouring agents, in particular as food colouring agents, and as medicaments and disinfectants.

The present disclosure relates to a process for preparing a Lawsonia inermis extract which is rich in Lawsone. It also relates to the extract which may be obtained by said process and to a composition comprising thereof. The disclosure also relates to a method for dying fibers, in particular keratin fibers.