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.

A process for applying a fluorescent leak detection dye to a component of an air conditioning system. The process involves the steps of (i) providing a fluorescent dye that is solid at room temperature, (ii) exposing the dye to an elevated temperature to melt the dye into a liquid or flowable state, (iii) injecting, channeling, spraying or placing the flowable dye into or on a component or an HVAC or A/C system, (iv) allowing the dye to resolidify in or on the component, (v) attaching the component to the HVAC or A/C system, and (iv) dissolving the resolidified dye in a liquid/gas.

The present invention involves an improved process for the preparation of Indocyanine green of Formula (I) having high purity of about 99%, wherein the process comprises steps of reacting 1,1,2-trimethyl-1H-benzo[e]indole with 1,4-butane sulfone in boiling solvent to give 4-(1,1,2-trimethyl-1H-benzo[e]indolium-3-yl)butane-1-sulfonate. Followed by reacting 4-(1,1,2-trimethyl-1H-benzo[e]indolium-3-yl)butane-1-sulfonate of Formula (IV) and N-phenyl-N-((1E,3E,5E)-5-(phenylimino)penta-1,3-dienyl)acetamide of formula (V) in presence of sodium acetate and alcohol; and extracting the title compound formula (I) with an ester solvent.

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The present invention relates to compositions for the preparation of solutions for contrast staining of biological, cytological, histological and autopsical samples, and their use in the preparation of said samples to be analysed.

Radiation-curable compositions of Pigment Violet 23 are described which can be used advantageously in UV inks for inkjet printing machines. Soiling containing such UV inks, especially within inkjet printing machines, can be removed particularly easily in a contactless procedure with conventional cleaners. The radiation-curable compositions described contain at least one modified Pigment Violet 23 which carries at least one polar functional group of the formula (I):
X-E (I) where X is a bridging group and E is a polar molecule radical.

The present disclosure is drawn to aqueous pigment co-dispersions. The co-dispersions include self-dispersed pigment with a chemically modified surface; released surface moieties from the self-dispersing pigment; pigment powder having the released surface moieties associated with pigment powder surfaces; polymeric dispersant; and water.

The invention relates to a process of creating particles of controlled size by creating them in the interstitial regions in a continuous liquid phase that contains a second, inert gas phase at high volume fraction; namely a foam. The second phase creates a physical barrier that limits the aggregation of formed particles beyond the size of the narrow interstitial regions occupied by the continuous phase. This technique is useful when the particles normally create large aggregates due to the fast nature of the reaction and the strong attractions between the formed particles, and for enhancing the deposition of high-value materials by connecting them to coacervates of controlled size.

A colorimetric radiation detector and a method for detecting radiation is disclosed. The colorimetric radiation detector also includes a metal oxyhalide that reaches an excited state on exposure to x-ray or ultraviolet radiation. The detector also includes a dye or where the metal oxyhalide is a bismuth oxyhalide, such as a bismuth oxychloride. The dye may include a redox reactive dye. The redox reactive dye may include Rhodamine B. The dye undergoes a permanent color change by reacting with the metal oxyhalide when the metal oxyhalide is exposed to x-ray or ultraviolet radiation. The dye may include a fluorescent dye, such as a fluorescein dye, such as 6-carboxy fluorescein or 5-carboxy fluorescein. The solvent may include a Lewis base solvent. The Lewis base solvent may include water or an alcohol. A method for evaluating a photoprotective topical lotion is also disclosed.

The novel pigment preparations containing at least one metal azo pigment A) and at least one aliphatic monocarboxylic acid B) having 10 to 22 carbon atoms are suitable for the colouring of plastics and in this connection feature improved heat stability.

This invention relates to non-bleeding, non-staining occult particles for use in granular or powdered laundry care compositions such as laundry detergents, laundry aids, and fabric care compositions. The occult particles are comprised of a clay carrier and a coloring agent and are characterized as being substantially indiscernible when contained in the laundry care composition.