I had now idea just how dirty snow was, even when it’s not yellow. -K
A few days back I mentioned gather snow in the quest for micrometeorites. I have looked a all manner of things collected from melted snow, regrettably no visitors from space. What I managed to find was primarily biological, various pollen, bits of bark and leaf, and spores of all sorts. A few of the samples had sat around for so long before I got to them that some very interesting fungus had cultured. I found one clear example of Pestalopezia and several unidentified Deuteromycetes and Zygomycetes. The closest thing I found to a micro-meteorite was a bit of soot that I suspect is attributable to the wood stove a the gentleman across the street.
It really was rather surprising the amount of material which I did find. None of the snow I collected appeared as anything other than fluffy white powder when I gathered it, and the detritus which settled out in the melt water was ample to say the least.