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
By ERICA MARTINEZ
A bag of Peanut M&M's with a blue, green, yellow, orange, and red one spilled onto the surface
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.
Peanut M&M's in brown, red, orange, yellow, blue and green
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.
A bag of Peanut M&M's on a wooden surface
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.
Colorful M&M's in a white bowl
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.