I've had an almost empty bottle of Jade Edouard sitting in my cabinet for about a year and a half. I had stoppered it with the original cork and thought that it would be OK for quite some time.

It seems like I was wrong about that.

When I poured myself a glass recently the absinthe looked a little cloudy but I didn't pay too much attention to it. After adding sugar and water, and after taking a small sip I realized that something was amiss. I looked again at the absinthe and saw that a very ugly brown scum had formed on the surface and the rest of the absinthe had a brownish tint to it (instead of the usual pearly green).

I'm not sure why this happened but I took some pictures (click the "more" link below).

Any thoughts?