this application relates to thiophene azo dyes for use as hueing agents , laundry care compositions comprising such thiophene azo dyes , processes for making such thiophene azo dyes , and laundry care compositions and methods of using the same . the thiophene azo dyes contain a formally charged moiety and are generally comprised of at least two components : at least one chromophore component and at least one polymeric component . suitable chromophore components generally fluoresce blue , red , violet , or purple color when exposed to ultraviolet light , or they may absorb light to reflect these same shades . these thiophene azo dyes are advantageous in providing a hueing effect , for example , a whitening effect to fabrics , while not building up over time and causing undesirable blue discoloration to the treated fabrics . the thiophene azo dyes are also generally stable to bleaching agents used in laundry care compositions .