A dye-releasing product for dyeing of or for refreshing of dyeing in textile materials is provided. The dye-releasing product includes a flat, cloth-like carrier material, and at least one coating applied onto the carrier material. At least one indigoid dye in its oxidized form is encompassed by the coating. The coating contains at least one binding agent for the at least one indigoid dye such that the at least one indigoid dye is released in an aqueous solution with a temperature equal to or greater than 20 C. that is, the coating is soluble, at least in part from the flat, cloth-like carrier material, which is added to the textile material to be dyed or whose dyeing is to be refreshed in a washing process.

Described herein are compositions including O,O-diacetyl leucoindigo. Also described herein are methods of pre-dyeing fibers with O,O-diacetyl leucoindigo, followed by developing the pre-dyed fibers using hydrolysis or oxidation conditions to form indigo-dyed fibers. Also disclosed are indigo-dyed fibers, textiles, and fabrics made using O,O-diacetyl leucoindigo, wherein cellulose, polyester, polyacrylonitrile, nylon, wool, and other compositional fiber types are suitably dyed with indigo dye using the described compositions and methods.

A leuco polymer includes a leuco monomer and an alkene. The leuco polymer has a molecular weight of at least 500 and is obtainable by polymerization of the leuco monomer and one or more alkene co-monomers. The leuco monomer consists of an alkene covalently bound to a leuco moiety and the leuco monomer has a molar extinction coefficient at a wavelength in the range 400 to 750 nm of less than 1000 M.sup.1cm.sup.1. The alkene monomer(s) have a molar extinction coefficient at a wavelength in the range 400 to 750 nm that is less than 100 M.sup.1cm.sup.1. Methods of making the leuco polymer, laundry care compositions comprising the leuco polymer and methods of treating textiles with such laundry care compositions.

A multifunctional continuous dyeing apparatus provided at a bottom with a main body within which are formed in a sequence, with reference to the feeding direction of the yarn, at least a first dyeing group for the yarn, provided with a respective first squeezing device of the yarn, an oxidation or diffusion/fixation group, placed downstream of the first dyeing group and arranged for the oxidation of the dyed yarn or for the diffusion/fixation of the dye in the fiber of the dyed yarn, and at least a second dyeing group of the yarn, arranged downstream of the oxidation or diffusion/fixation group and in turn provided with a respective second squeezing device of the yarn, where at least the first dyeing group, the first squeezing device, the oxidation or diffusion/fixation group and the second dyeing group are hermetically sealing enclosed by at least one covering case, integral at the top with the main body, and provided with a plurality of doors which are at least partially openable to perform the dyeing of the yarn in an environment exposed to air and which are reclosable to perform the dyeing of the yarn in an inert environment under nitrogen.

According to the present disclosure, a textile printing ink jet ink composition includes a thioindigo-skeleton-containing dye and elemental sulfur. A content of the elemental sulfur in the textile printing ink jet ink composition is 0.01 ppm or greater and 500 ppm or less relative to the total mass of the ink composition.

A dye fixing section in a foam indigo dyeing machine for dyeing traveling sheets of textile yarn. The dye fixing section receives traveling sheets of yarn to which indigo dye in leuco form has been applied and penetrated partially through the yarn. Oxygen is applied to the substrate to set the dye at the level of penetration achieved as it enters the dye fixing section, to produce yarns in the sheet with outer dyed rings and undyed cores.

A leuco polymer includes a leuco monomer and an alkene. The leuco polymer has a molecular weight of at least 500 and is obtainable by polymerization of the leuco monomer and one or more alkene co-monomers. The leuco monomer consists of an alkene covalently bound to a leuco moiety and the leuco monomer has a molar extinction coefficient at a wavelength in the range 400 to 750 nm of less than 1000 M.sup.1cm.sup.1. The alkene monomer(s) have a molar extinction coefficient at a wavelength in the range 400 to 750 nm that is less than 100 M.sup.1cm.sup.1. Methods of making the leuco polymer, laundry care compositions comprising the leuco polymer and methods of treating textiles with such laundry care compositions.

Dyeing of yarn to create indigo colored outer ring surrounding a white core. The techniques describe ways to keep the white core.

Method of making an aqueous aniline-free or aniline-free and N-methylaniline-free leucoindigo solution from an aqueous leucoindigo solution comprising aniline or aniline and N-methylaniline, the concentration of aniline or aniline and N-methylaniline being determined according to ISO 14362-1:2017(E), wherein said leucoindigo is in the form of an alkali metal salt, the method comprising at least steps (A) to (C): (A) providing a liquid stream comprising said aqueous leucoindigo solution comprising said amine(s); (B) providing a purification stream; (C) bringing into contact said liquid stream with said purification stream.

Provided is a reduction dyeing method for indigo color using Nesterenkonia sp. KDB2, KDB3 and/or KDB4. The reduction dyeing method is relatively simple, efficient and allows good reproducibility, by using Nesterenkonia sp. KDB2, KDB3 and/or KDB4 bacterial strains instead of a traditional fermentation process which entails poor reproducibility and is exacting and complicated.