Our first step would be to make a mold of the cigar tips, using powdered alginate—a hard, fast-setting, rubbery gum extracted from seaweed. When reconstituted with water to about the consistency of pancake batter, alginate can conform to the most minute, subtle textural details, capturing even fingerprints and skin pores. For that reason, the material was widely used in dentistry and also in Hollywood, where it was used to make molds of actors’ faces, as a step in creating special-effects makeup.