An emblem that is a temporary emblem ceases to exist as a turn-based action. This is a new turn-based action which is the last turn-based action of the untap step. It applies regardless of which player is the active player. (This will be added into the Rules section later.)

Only the parts of mana symbols that are of that color are affected; anything else about the mana symbol (the other half of a hybrid symbol, whether or not it is Phyrexian, etc) remains unchanged even if the color changes.