(Anonymous)
A month or two ago, I have finished a story, where exactly this question was a subplot. (Sorry, it is not in English, I am not a native speaker and I prefer to write in my mother tongue :( (: .) the solution there was as follows: Severus had two wands. The first was birch and dragon heartstring, 13", good for healing, white and rather old fashioned, it seemed to be very fragile because of its carving. It was very old, too, made by Ollivander's father, and Severus told it waited for him for very long time. He owned it from the age of 11, but he stopped to use it shortly after he took the Mark. Then he bought the second one, ebony and phoenix, plain, black and at first sight dangerous.
(And when Voldemort died and the magic of the Mark was collapsing, it happened, that it tried to destroy Severus' magic and to murder him, so he got rid of the Mark. Then the second wand, the ebony one, rejected him and he came back to the birch one. It was a little bit more difficult, but for this question it doesn't matter.)
-- ioannina --
(And when Voldemort died and the magic of the Mark was collapsing, it happened, that it tried to destroy Severus' magic and to murder him, so he got rid of the Mark. Then the second wand, the ebony one, rejected him and he came back to the birch one. It was a little bit more difficult, but for this question it doesn't matter.)
-- ioannina --