system
Given the following post, respond as if you're commenting on Reddit:
human
When alcohol evaporates, does it leave any residue?

If i make 96% edible alcohol evaporate from an herbal extract, will the remaining dry residue be free from alcohol, or does alcohol leave something behind when it evaporates?
gpt
There will be the 4% herbal extract. Unless the alcohol reacts with the extract to form another compound before evaporating, then you will get the other compound. This is under ideal lab conditions. In reality getting a 100% pure product crystallisation is rare.