The word "melanise" is a verb that means to make something black or to become black. It can also refer to the process of converting something into or infiltrating it with melanin, which is the pigment that gives color to skin, hair, and eyes.
You can use "melanise" when you are talking about something changing color to black, often due to damage or staining. It is not a common word, so be careful to use it in the right context.
In more scientific contexts, "melanise" may refer to a biological process where melanin is produced in living organisms. For example, when certain animals adapt to their environment, they might melanise to have darker skin or fur.
While "melanise" primarily refers to the color black or the pigment melanin, it can also imply a change due to external factors, like pollution or fire, that causes something to appear blackened.
There aren’t specific idioms or phrasal verbs that use "melanise" directly, but you might hear phrases like "black as coal" to describe something very dark.