About 3 years ago, wanting to make my own rhythm bones from scratch I got a few rib bones from a local butcher. I don’t have a garden so I left them on a southern facing window sill – 3 stories up – for about a year since it wasn’t clear I could stink up the place by putting them to macerate in some water. But with time it seemed obvious that just drying in the sun wasn’t going to get the grease out even with the help of a bugs.
So I covered them with water in a bucket in my workshop, put something on top of the bucket and forgot them. I wasn’t in my workshop very often at the time so maybe 4 months went by before I thought to check them out. I uncovered the bucket and found a horrible black swill which I flushed down the toilet as fast as I could… Yuck!
The bones had turned green, stunk, and still seemed pretty greasy.