Instead of using coffee filters, i like to just pour off the naptha (assuming you don't have any floaties

), then evap/dry the spice in the container you used to freeze precip. Then just strape out the spice, and use a bit of dry alcohol to get the last bit, or just dissolve it in naptha your using for the next precipitation. Alot easier than using coffee filters that the spice melts into alot of times, and is hard to scrape up the spice off of even if it does not melt.
Venting the containers, or not sealing them well always gets water droplets in the naptha i find, and its best to make sure its sealed as well as possible before freezing.
Keep the finished spice as cool as possible, but its not necessary to freeze it. It is if you want it to keep for a long time, but in that case its just easier to salt it and store it as a crystalline solid that wont melt, and is much more stable. Then base it later with lime or sodium carbonate and pull again with warm naptha to freeze precip again.
The spice will melt if you get it too warm, but as long as its under 75F you should be fine.
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