

In 1976, the color orange was added to the mix to replace red, which was discontinued in response to the "red dye scare" over Red Dyes #2 and #4 having been evaluated to be carcinogenic in nature. In 1960, M&M's added the yellow, red, and green colors. Peanut M&M's were introduced in 1954 but first appeared only in the color tan. In the early 1950s, the Midwest Research Institute (now MRIGlobal) in Kansas City, Missouri, worked on behalf of M&M's to perfect a process whereby 3,300 pounds (1,500 kg) of chocolate centers could be coated every hour. In 1950, a black "M" was imprinted on the candies giving them a unique trademark. In 1949, the brand introduced the tagline "Melts in your mouth, not in your hand." Despite commonly reported misinformation online, each colored M&M does not have a different flavor and all possess the same chocolate taste. The company's longest-lasting slogan reflects this: "Melts in your mouth, not in your hand." A traditional milk chocolate M&M weighs about 0.91 grams / 0.032 ounces and has about 4.7 calories (kcal) of food energy (1.7 kcal from fat). The candy-coated chocolate concept was inspired by a method used to allow soldiers in the Spanish Civil War (1936–1939) to carry chocolate in warm climates without it melting. They are produced in different colors, some of which have changed over the years. The candy originated in the United States in 1941, and M&M's have been sold in over 100 countries since 2003. M&M's are the flagship product of the Mars Wrigley Confectionery division of Mars, Incorporated. Numerous other variations have been introduced, some of which are regular widespread varieties ( peanut butter, almond, pretzel, crispy, dark chocolate, and caramel) while others are limited in duration or geographic availability. Peanut M&M's, which feature a peanut coated in milk chocolate, and finally a candy shell, were the first variation to be introduced, and they remain a regular variety. The original candy has a semi-sweet chocolate filling which, upon introduction of other variations, was branded as the "plain, normal" variety.

M&M's (stylized as m&m's) are multi-colored button-shaped chocolates, each of which has the letter " m" printed in lower case in white on one side, consisting of a candy shell surrounding a filling which varies depending upon the variety of M&M's.
