Tarball errata

Curious about my "tarballs", I shot off an email to Kenneth Libbrecht (www.snowcrystals.com) to ask his opinion. He thinks they are not related to pollution at all.

"I see similar things quite frequently. I believe your blobs are simply water droplets that collided with the falling snow crystal."

And here I was, thinking I had a photo making a statement...

Oh, well...