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You've bruised or injured it in some way or it has died and needs to fall off.
Nails are made up of keratin like hair. The blood supply for the fingernails and toenails is at the base or growth area. If the base of the nails is damaged then the entire nail will turn black and die and fall off. If the damage is not permanent a new nail will grow from the base. Fingernails take about 5 months to grow from base to fingertip, toenails take about 1 year to totally regrow.
because toenails turn her on
Starch.
Rusting
Mold
Peanut butter
Gravitation.
Brake dust!
Bugs are wiping their asses on them
when their born they are black and brown, but as they grow older majority of them turn grey/silver where they used to be black.
Alkaptonuria is an inherited condition that causes urine to turn black when exposed to air.