“Fatliquors” for leathers: an application of microemulsion—a review

“Fatliquor” is the most widely used wet chemical applied in the form of an emulsion at the end process of leather tanning. It keeps the leather soft, smooth, light, and heat fasting by preventing the fibrils from the aggregation and filling the voids. It pronounces most effectively on the softness, tensile properties, antifungal, and antimicrobial properties. Here this review article represents different fatliquors, its formation, applications and contemporary developments, and new challenges in producing the environment-friendly fatliquors. Applications of new novel classes of multifunctional fatliquors with excellent surface activities, biodegradability, antifungal, antimicrobial properties which are the keys to the effective fatliquoring have been focused.