mold
put black paint in it
The juices in the apple react with the oxygen in the air, causing the flesh to discolour.
Vinegar is an acid (acetic acid). It will oxidize metals (causing them to rust)...which can look black.
Powdered limestone has to be heated with powdered clay to turn it into to cement. You can then use cement and powder it, then mix with water, sand crushed rock and a slow reaction takes place forming concrete. It is in the Cors Science GCSE
Cat whiskers turn black due to the presence of melanin, a pigment that gives color to hair and skin. Melanin production increases as cats age, causing their whiskers to darken over time.
i think it might mean he/she is a little afraid of you. i have 2 jackson chameleons and my girl one is black. i just got her so she could be frightened causing her to turn black.
Nickel can turn black due to the formation of nickel oxide on its surface, which is a result of oxidation in the presence of oxygen or moisture. This black layer can also contain other compounds or impurities, causing the discoloration. Regular cleaning and maintenance can help prevent nickel from turning black.
Windex has ammonium hydroxide and other cleaning agents. One of them may have bleached your patio.
Your jalapeno may have turned black due to overripening or exposure to extreme temperatures, causing the skin to darken. It could also be a sign of a fungal infection or rot.
hydraulic cement, after the combination is grind ed into a fine powder!
You are either born black or not, and you can't simply "turn" black at will.
Not naturally it can't turn black.