Wendy's then turned its attention to French fries, switching from a mixture of potato varieties to only Russet potatoes, sliced with the skin still on, and sprinkled with sea salt.

WSJ: Wendy's Set to Unseat Burger King as No. 2 Chain

Unfortunately, these chains come in several varieties, and making useful materials from them requires that the amount of each variety in the mixture be controlled, as the properties of the resulting material depend on the proportions of its components.

ECONOMIST: Evanescent or evergreen?