They're wrapped up in thin foil packaging, blue for vanilla and brown for mocha. (busyinbrooklyn.com)
For example, it is not possible to detect thin foils, insects or molluscs, hair, wood, fibres, textiles, and plastics consisting only of hydrocarbons (PP, PA, PC, etc.). (sesotec.com)
As a fringe benefit, Cowan's group placed thin foils of gold in Petawatt's path to observe its startling effects on matter. (sciencemag.org)