Didn't work?

I let it simmer for 8 hours, then drained it in a tall deep glass and set it in the freezer. I let it settle and I scraped the butter from the top (some plant matter stuck to butter, not a problem). I spread it on some toast, nothing. Then I did it again, nothing. About an hour ago I had a nice big chunk and still nothing.

Butter is dark green (not emerald, about lime green) with some ground plant matter attached. Water was rusty brown.

What did I do wrong? This is the third 8th I've ruined this week!