Goodness, I've never seen such a dark champagne before. If I didn't know what it was, I'd be guessing Shiraz for the grape, or perhaps a Cabernet - Merlot blend.
The Piper-Heidsieck Brut Rosé Sauvage NV is really dark, but when you hold it up to the light you see more of onion-skin than raspberry. And it smells pretty fantastic.
It smells, in fact, properly Champagne-like, but with a big blast of red fruit flavours and a strong mineral - specifically metallic, most specifically copper - element. The coppery tang almost makes me think of a well-hopped amber ale.
The palate is complex, offering a dry attack, a sweet mid-palate, a drying finish, and lovely red-fruit aftertaste. There's more of the coppery flavour in there; coming from, I think, Pinot Noir.
It looks really beautiful too. The dark colour is complemented by a very lively stream of fine bubbles. An excellent and unusual champagne, 3-4.