Patents

Leather being a natural material, often does not produce consistent physical properties including appearance. The situation is more complicated when leathers of different batches are pooled together for dyeing. Variations in colour intensity of dyed leathers are a major technological problem in leather making. This poses serious economical problem in the case of leathers where dyeing colour decides the final quality of leather. The invention provides process of leather dyeing using an aqueous suspension of M2+/Al3+ layered double hydroxide (LDH) thereby minimizing variations in colour of the leathers ensuring consistency both within a batch of leathers and batch to batch of leathers, without adversely affecting other characteristics of the leathers and thus preventing productivity and economic loss.