Weybridge, England-April 11, 2011.  Large bag of Peanut M and Ms on a white background.  M and M's are sold by Mars co. which is a family owned company that is almost 100 years old.  M and Ms were first introduced in 1941 as a way to sell chocolate in warm locations.  They melt in your mouth, not in your hands.
Food - Drink
Peanut M&M's Lacked The Iconic Colorful Look When They Debuted
In 1954, M&M’s added their iconic Peanut M&M, and while opening a bag of them today will reveal a rainbow of colors, they were first released in one single color: tan.
It wasn't until 1960 that the company decided to add yellow, red, and green colors to the Peanut M&M line up, which eventually went on to match the colors of the original candies.
1954 was a big year for M&M’s overall, as it was also when the color of the “M” on the candies became white and the tagline "Melts in your mouth, not in your hand" first appeared.
Today, other popular varieties of M&M's include peanut butter, pretzel, and almond, all bearing the same colors as plain and Peanut M&M's.