105. Colors
105.1. There are five colors in the Magic game: white, blue, black, red, and green.
105.4. If a player is asked to choose a color, they must choose one of the five colors. “Multicolored” is
not a color. Neither is “colorless.”
202.2b Objects with no colored mana symbols in their mana costs are colorless.
202.2e An object may have a color indicator printed to the left of the type line. That object is each
color denoted by that color indicator. (See rule 204.)
202.2f Effects may change an object’s color, give a color to a colorless object, or make a colored
object become colorless; see rule 105.3.
(For 202.2f, I do not know of any actual effect that might give a color to a card in a graveyard.)
Private Mod Note
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Why bother with mere rulings when so many answers can be found in the Rules?
I'm asking this for grindstone
(For 202.2f, I do not know of any actual effect that might give a color to a card in a graveyard.)
The first card I can think of that would do this is Celestial Dawn. But you aren't going to run into this effect very often.