Pringles, an American brand of stackable potato-based chips, contains what percentage of potatoes?

Pringles, an American brand of stackable potato-based chips, are not officially considered potato chips. They are made from potatoes, but not entirely. Pringles are made by preparing a slurry substance that is obtained from corn, potato flakes, rice, and wheat. In 2008 a lower British court ruled that Pringles were not potato chips because they contained only a 42 percent potato content and had "a shape not found in nature". Pringles, a brand of chips that was invented by Procter & Gamble (P&G) and began selling in Indiana in 1968, was first marketed as "Pringles Newfangled Potato Chips".

In 1956, P&G assigned a task to chemist Fredric J. Baur (1918–2008). He was asked to develop a new kind of potato chip. Baur spent two years developing saddle-shaped chips from fried dough, and selected a tubular can as the chips' container. The saddle-shape of Pringles chips is mathematically known as a hyperbolic paraboloid. Baur however could not figure out how to make the chips palatable; his personal efforts were stopped.

In the mid-1960s another P&G researcher, Alexander Liepa of Montgomery, Ohio, restarted Baur's work. He succeeded in improving the taste. Although Baur designed the shape of the chip, Liepa's name is on the patent. Gene Wolfe, a mechanical engineer and author known of science fiction/fantasy novels, helped develop the machine that cooks Pringles.

It was introduced in 1968 and by 1975 was available across the US. By 1991 it was distributed internationally.