The present invention concerns an auxochrome substituent for an oxidative dye coupler. The auxochrome substituent enables ready developer reaction with the coupler to form azomethine and leuco dyes. Manipulation of the auxochrome substituent enables a bathochromic or hypsochromic shift of the light absorbance by the azomethine dye formed with the auxochrome substituted coupler.

The present invention relates to fluorescent dyes of formula (I), including salts thereof, and extracellular vesicles and cells labelled with the fluorescent dyes. The present invention also relates to methods, uses and kits thereof.

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The subject of the present invention is a process for treating keratin fibers using an anhydrous dye composition comprising at least one compound of azomethine type comprising two pyrazolopyridine units of formula (I) or (II) and an aqueous composition. The invention also relates to a kit comprising an anhydrous dyeing composition and an aqueous composition. ##STR00001##

A thermal transfer recording sheet includes a base material and, on the base material, a yellow-dye layer containing a yellow dye, a magenta-dye layer containing a magenta dye, and a cyan-dye layer containing a cyan dye. The yellow dye and the cyan dye contain compounds having specific structures.

There are provided a fluorescent compound represented by General Formula (1) and a fluorescently labeled biological substance using the fluorescent compound.

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In the formula, FL indicates an n-valent phosphor moiety, and n is an integer of 1 or more.

R.sup.11 to R.sup.15 represent a hydrogen atom or a substituent. However, at least one combination of the combination of R.sup.11 and R.sup.12 or the combination of R.sup.12 and R.sup.13 is a combination in which one is SO.sub.3.sup.?X.sup.+ and the other is a substituent. X.sup.+ represents a hydrogen ion or a metal ion.

A coloring compound comprises a triphenylmethane structure having specific substituents.

A water-based ink for ink-jet recording includes dyes and water. The dyes include a blue dye having a hue angle of 220 to 280; a yellow dye having a hue angle of 70 to 120; and a copper phthalocyanine dye. A mass ratio (C/B) of a content (C) of the copper phthalocyanine dye to a content (B) of the blue dye in an entire amount of the water-based ink is equal to or more than 0.5, and a total content of the dyes in the entire amount of the water-based ink is equal to or more than 6% by mass.

Provided are any one of the following fluorescent compounds and a fluorescent labeled biological substance having this fluorescent compound. ##STR00001## X represents CR.sup.5 or N, and R.sup.1 to R.sup.7, Q.sup.1, Q.sup.2, L.sup.1, and L.sup.2 each represent a specific group. a ring ?.sub.1 and a ring ?.sub.2 are a 5- to 8-membered ring, At least one of R.sup.1 to R.sup.7, L.sup.1, L.sup.2, Q.sup.1, or Q.sup.2 has a specific hydrophilic group. However, in a case where the ring ?.sub.1 and the ring ?.sub.2 are a 6-membered ring, and L.sup.1 and L.sup.2 are an arylene group, R.sup.5 is not an aryl group substituted with a linear alkyl group having 18 or more carbon atoms. In addition to the regulation of the ring ?.sub.1, the ring ?.sub.2, L.sup.1, and L.sup.2, in a case where R.sup.5 has a substituent having a dipyrromethene boron complex structure, the dipyrromethene boron complex structure has a structure in which a dipyrromethene skeleton is coordinately bonded to a boron atom in the tridentate or tetradentate coordination.

In an ultraviolet-curable resin composition for an optical fiber coating, the polarity parameter E.sub.T(30) of the resin composition is 47 to 61.

Electrowetting apparatus including at least one compound selected from the group consisting of: ##STR00001##
wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is independently an alkyl group. In examples a fluid includes a dye compound selected from: ##STR00002##