Ria Dyes and Chemicals Co., India AHMEDABAD, Gujarat

We are a noteworthy name when it comes to Water soluble dyes that is the perfect outcome of premium material and advanced processing techniques. We are supported by a team of professionals who ensure that the offered lot is prepared using the best quality raw material. Also, they confirm that the material is sourced from the certified places.

Acid dyes are water-soluble anionic dyes that are applied to fibres such as silk, wool, nylon and modified acrylic fibres from neutral to acid dye baths. Attachment to the fibre is attributed, at least partly, to salt formation between anionic groups in the dyes and cationic groups in the fibre. Water-soluble Acid dyes are not substantive to cellulosic fibres. Acid dyes are used both commercially and by the studio dyer to dye proteinanimal fibers such as wool, silk, mohair, angora, alpaca and some nylons and synthetics. Acid dyes require the use of an acid such as vinegar, acetic or sulphuric acid to set the color.

Direct dyes are a class of dyes, one of the two types of dyes that are mixed in 'all purpose' dyes such as rit. (the other type in the mixture is an acid dye, which will not stay in any cellulose fiber for long.) the shades of direct dyes are duller than those provided by fiber reactive dyes and the wash fastness is poor while they may be more lightfast. The "direct dye" classification in the color index system refers to various planar, highly conjugated molecular structures that also contain one or more anionic sulfonate group. It is because of these sulfonate groups that the molecules are soluble in water. Though most direct dyes still can be obtained in powder form, it is increasingly popular to receive them as liquid concentrates. The advantage of concentrates is that they are easy to handle and meter. The disadvantage is that the surfactants and co-solvents needed to keep the dye concentrates stable may interfere with retention and sizing in the case of very deeply colored grades.

Food coloring is a substance, liquid or powder, when added to food or drink to change its color. Food coloring is used both in commercial food production and in domestic cooking. Due to its safety and general availability, food coloring is also used in a variety of non-food applications, for example in home craft projects and in education. These colors come in two forms: Dyes and Lakes. Dyes are water-soluble but are insoluble in oil. They are manufactured as powders, granules, liquids or other special forms making them an ideal coloring agent for beverages, confections, baked goods etc. Lakes are made by combining dyes with salts to make insoluble compounds, which tint by dispersion. Lakes are not oil soluble, but are oil dispersible. These form of Food colors are more stable than dyes and are ideal for coloring products containing fats and oils or items lacking sufficient moisture to dissolve dyes.

A finely divided material, which contributes to optical and other properties of paint, finishes, and coatings. Pigments are insoluble in the coating material, a characteristic in contrast to dyes. Pigments are mechanically mixed with the coating and are deposited when the coating dries. Their physical properties generally are not changed by incorporation in and deposition from the vehicle. Pigments may be classified according to composition (inorganic or organic) or by source (natural or synthetic). However, the most useful classification is by color (white, transparent, or colored) and by function. Special pigments include anticorrosive, metallic, and luminous pigments.

Reactive dyes are a class of highly colored organic substances, primarily used for tinting textiles, which attach themselves to their substrates by a chemical reaction that forms a covalent bond between the molecule of dye and that of the fibre. The dyestuff thus becomes a part of the fibre and is much less likely to be removed by washing than are dyestuffs that adhere by adsorption. Different groups of reactive dyes are available for dyeingprinting purposes with varying dyeing parameters and fastness properties.