fabric hueing agent sometimes referred to as shading bluing or whitening agents typically the hueing agent provides a blue or violet shade to fabric hueing agents can be used either alone or in combination to create a specific shade of hueing and or to shade different fabric types this may be provided for example by mixing a red and green blue dye to yield a blue or violet shade hueing agents may be selected from any known chemical class of dye including but not limited to acridine anthraquinone including polycyclic quinones azine azo e g monoazo disazo trisazo tetrakisazo polyazo including premetallized azo benzodifurane and benzodifuranone carotenoid coumarin cyanine diazahemicyanine diphenylmethane formazan hemicyanine indigoids methane naphthalimides naphthoquinone nitro and nitroso oxazine phthalocyanine pyrazoles stilbene styryl triarylmethane triphenylmethane xanthenes and mixtures thereof suitable fabric hueing agents include dyes dye clay conjugates and organic and inorganic pigments suitable dyes include small molecule dyes and polymeric dyes suitable small molecule dyes include small molecule dyes selected from the group consisting of dyes falling into the colour index c i classifications of direct basic reactive or hydrolysed reactive solvent or disperse dyes for example that are classified as blue violet red green or black and provide the desired shade either alone or in combination in another aspect suitable small molecule dyes include small molecule dyes selected from the group consisting of colour index society of dyers and colourists bradford uk numbers direct violet dyes such as 9 35 48 51 66 and 99 direct blue dyes such as 1 71.