Another curious feature observed in specimens from southern Florida is melanism.
From the en.wikipedia.org
This single supergene also appears important in melanism in other species, including moths.
From the sciencedaily.com
As for the title of your topic, the opposite of albinism is melanism.
From the en.wikipedia.org
Partial melanism in badgers is known, and albinos are not uncommon.
From the en.wikipedia.org
Throughout his childhood, David Myers was told that his skin color was a disease called melanism.
From the orlandosentinel.com
What advantage melanism brings in these circumstances is obscure.
From the economist.com
Other rare color morphs of the species include speckles, melanism, albinism and gray coloration.
From the en.wikipedia.org
Melanism refers to an excess of black or dark colours.
From the en.wikipedia.org
Melanism in leopards is inherited as a Mendelian, monogenicrecessive trait relative to the spotted form.
From the en.wikipedia.org
More examples
Melanosis: a condition characterized by abnormal deposits of melanin (especially in the skin)
Melanism is a development of the dark-colored pigment melanin in the skin or its appendages and is the opposite of albinism. Historically, it was also the medical term for black jaundice.
(Melanistic) abnormally dark, especially due to an increase of melanin.
(Melanistic) having an unordinary amount of melanin or black pigment.
(Melanistic (or melanoid)) Color mutant where the shiny pigment cells (iridophores) are not developed. Melanoid axolotls are sometimes darker in color than normal and lack the shiny ring around the eyes.
(Melanistic) The black or dark color form of an organismAnything that is alive..
(Melanistic) derived from melanin, a dark coloured skin and hair pigment. In cats, melanism results in the fur of the animal being very dark or black in colour. ...
(Melanistic) is a term that refers to the black color phase of some mammals. For example, some populations of marmots are melanistic or black.
(melanistic) Darker coloration of the skin, hair, or fur.