Systems and methods are described whereby a deoxygenated liquid dye material is made by supplying the deoxygenated inert gas to a liquid dye material that is susceptible to oxidation, and mixing the liquid dye material in the presence of the supplied deoxygenated inert gas with water and at least one dye formulation component selected from the group consisting of reducing agents, pH adjusters, foaming agents, wetting agents and auxiliary chemicals to form a deoxygenated aqueous dye composition having an oxygen content of 30 ppm oxygen or less. A supply of inert gas may be provided which is then passed to a gas purifier to reduce oxygen content in the inert gas to, e.g., 1 ppb oxygen or less. The deoxygenated aqueous dye composition that is formed may have an oxygen content of 1 ppm or less.

Provided is a fluorescent compound represented by the following [Chemical Formula 1] and a method for preparing the same: ##STR00001## wherein each of X, Y, R.sub.1, R.sub.2, R.sub.3 and n is the same as defined in the specification.

The present invention relates to the use of indigo derivatives for dyeing synthetic textiles to a process for dyeing synthetic textiles and to dyed textiles and articles containing them. The invention also relates to novel indigo derivatives per se and to a process for the preparation thereof.

The present invention relates to the use of indigo derivatives for dyeing synthetic textiles to a process for dyeing synthetic textiles and to dyed textiles and articles containing them. The invention also relates to novel indigo derivatives per se and to a process for the preparation thereof.

Described herein are methods of dyeing fibers, and dyed fibers and textiles made using the methods. The methods involve contacting a fiber with a dye liquor at a dye liquor temperature of about 30 C. to 115 C. to form a dyed fiber, wherein the dye liquor components include at least N,N-diacetyl indigo and a salt solution having ionic strength of about 0.03 M (moles/liter) to 1 M and pH of about 3 to 8 at 20 C. The contacting is generally carried out for a contact period of about 10 seconds to 30 minutes, for example by immersing the fiber in the heated dye liquor. By using the disclosed methods, N,N-diacetyl indigo is substantially uniformly distributed on the dyed fiber to provide intense, vibrant colors affixed thereto. Dyed textiles display substantially uniform color.

Described herein are methods of dyeing fibers, and dyed fibers and textiles made using the methods. The methods involve contacting a fiber with a dye liquor at a dye liquor temperature of about 30 C. to 115 C. to form a dyed fiber, wherein the dye liquor components include at least N,N-diacetyl indigo and a salt solution having ionic strength of about 0.03 M (moles/liter) to 1 M and pH of about 3 to 8 at 20 C. The contacting is generally carried out for a contact period of about 10 seconds to 30 minutes, for example by immersing the fiber in the heated dye liquor. By using the disclosed methods, N,N-diacetyl indigo is substantially uniformly distributed on the dyed fiber to provide intense, vibrant colors affixed thereto. Dyed textiles display substantially uniform color.

The present invention relates to an improved process for preparation of Indigo carmine of Formula (I), in high purity, more than 99.5%.

The present invention relates to an improved process for preparation of Indigo carmine of Formula (I), in high purity, more than 99.5%.

The present disclosure relates to the biosynthesis of indigoid dye precursors and their conversion to indigoid dyes. Specifically, the present disclosure relates to methods of using polypeptides to produce indigoid dye precursors from indole feed compounds, and the use of the indigoid dye precursors to produce indigoid dyes.

The present disclosure relates to the biosynthesis of indigoid dye precursors and their conversion to indigoid dyes. Specifically, the present disclosure relates to methods of using polypeptides to produce indigoid dye precursors from indole feed compounds, and the use of the indigoid dye precursors to produce indigoid dyes.