The invention consists of a process to improve the resistance to stains on yarns, on the basis of wool, silk, polyamide, polyacrilonitrile, natural and artificial cellulosic fibres and in general, all other synthetical fibres which can be dyed. According to the invention the yarns are treated during the dyeing process with an aqueous solution containing up to 5% tannic acid in acid medium. It is economically advisable to add a stabiliser to the solution to avoid oxidation of the solution and the fibres, and possibly a wetting agent. Preferably the treatment is made during the dyeing procedure, before, during or after the effective dyeing step.

A low-staining orange food coloring composition and a process of producing such a food coloring is disclosed, as well as an orange colored beverage composition colored with such a food coloring composition and a process of producing such a beverage. The orange food coloring composition comprises a combination of a yellow dye selected from the group consisting of FD&C Yellow #5, quinoline yellow and combinations thereof and a red dye selected from the group consisting of carmoisine, Ponceau 4R, FD&C Red #40, amaranth and combinations thereof.

Methods of enhancing stain resistance of fibers, carpet yarns and carpets are disclosed. In one aspect, the invention relates to a method of treating fiber, yarn or carpet comprising applying an aqueous treating composition to fiber, yarn or carpet, wherein the aqueous treating composition comprises tannic acid heating the fiber, yarn or carpet to a temperature of at least about 160.degree. F.; applying a second topical treating composition to the fiber, carpet or yarn, wherein the second aqueous treating composition comprises a fluorochemical; and heating the fiber, yarn or carpet to a temperature of at least about 160.degree. F.

Methods of enhancing stain resistance of fibers, carpet yarns and carpets are disclosed. Treating compositions used to enhance the stain resistance of fibers, carpet yarns and carpets are also disclosed.