<prompt> Cataract brunescens results due to deposition of -CopperIronSilverUrochrome  <response>: In nuclear senile cataract, there may or may not be associated with deposition of pigment urochrome andor melanin derived from amino acids in the lens.Commonly observed pigmented nuclear cataracts are amber, brown cataract brunescens or black cataract nigra and rarely reddishcataract Rubra in colour. 