I've redesigned the label this year, (the 2008 is a surprise.)
You can leave the corks plain, seal them with sealing wax, or cover with a piece of fabric.
In order to turn it's beautiful deep black color the mix needs contact with oxygen so don't cap tightly.
Incidentally, while the 2008 vintage is ready to drink ~ the 2007 vintage is even more mellow and really developing into something special after a year in the bottle:
If you look carefully you can see that it has developed very nice 'legs'.