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Formation of coffee stain deposits under evaporation of droplets containing aqueous solution of salts placed on silicone-oil impregnated porous substrates was observed. The formation of ring-like deposits was registered for various molar concentrations of salts for the droplets of 5–300μl in volume. The effect occurred when the contact line was de-pinned, and the evaporation from the edge of a droplet...
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