FIG. 1.
A gallery of original droplets (upper) and their corresponding residues (lower) indicating the various morphologies of residues formed. Single residues form by (a) non-pinning droplets evaporating on a coated glass surface, (b) pinned droplets evaporating on an uncoated glass surface, (c) film recoil of pinned droplets, and (d) contact pinned evaporation on stainless steel forming a large area of residue (marked by outline). Multiple residues form due to (e) roughness induced film breakup on a stainless steel surface (with arrows marking the individual residues) or (f) surface tension induced film breakup on a coated glass substrate.