<prompt> Cataract brunescens results due to deposition of-UrochromeCopperIronSilver  <response>: In nuclear senile cataract, there may or may not be assosiated deposition of pigment urochrome andor melanin derived from amino acids in the lens. commonly observed pigmented nuclear cataracts are amber,browncataracta brunescensor blackcataracta nigra and rarely reddishcataracta rubra in colour. REF IMG 