Paddington and the Disappearing Ink

One morning Paddington was in the garden testing some tricks from his conjuring outfit when he came across one he hadn't noticed before. It was called MAGIC DISAPPEARING INK and it looked very interesting indeed. There were three bottles inside the box. There was a black bottle which was full of everlasting ink that never disappeared; a red one containing some special ink which vanished soon after you had put it on; and a green bottle full of liquid which you brushed on to bring the words back again. It sounded very good value.