Water, soup, wet paint and other liquids often leave stains as they dry. They include "coffee rings" from dried coffee droplets, soup stains on the dining table, and the patterns salted snowmelt lays down on the pavement. Solvents leave a variety of residues as they evaporate from suspensions, including single rings, periodic bands, shapes resembling spider webs, and even wide uniform films assembled from arrested particles.
Water, soup, wet paint and other liquids often leave stains as they dry. They include "coffee rings" from dried coffee droplets, soup stains on the dining table, and the patterns salted snowmelt lays down on the pavement. Solvents leave a variety of residues as they evaporate from suspensions, including single rings, periodic bands, shapes resembling spider webs, and even wide uniform films assembled from arrested particles.
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