Cataract brunescens results due to deposition of-
In nuclear senile cataract, there may or may not be assosiated deposition of pigment urochrome and/or melanin derived from amino acids in the lens. commonly observed pigmented nuclear cataracts are amber,brown(cataracta brunescens)or black(cataracta nigra) and rarely reddish(cataracta rubra) in colour. REF IMG
Urochrome
Copper
Iron
Silver
Lens