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The letter "M" first appeared in 1950. Since much of the product was sold in bulk, the Mars Company wanted to make sure their customers received the real thing. They used the advertising slogan, "Look for the M on each piece."
In 1954, Peanut M&Ms were introduced. At the same time the M&M's brand characters and the famous slogan "The milk chocolate that melts in your mouth, not in your hand" were both trademarked.
When I was a kid whenever we'd visit my grandparents' house my grandmother kept M&Ms in her coffee table drawer. We knew she'd eventually offer us some. We just had to wait patiently to see when it was going to be. She kept two bags of M&Ms in the coffee table drawer one plain and one peanut.
Each time we went to her house we got to choose which kind we wanted. It was soon that I learned that she would give us less of the peanut kind and more of the plain so that I began to ask for the plain variety figuring out that I would get more of those. It was only then that we first had M&Ms and it was then that I remember all of the different colors of M&Ms featuring the tan ones.
It was until later when my sisters and I got older that we began spending our allowance money on M&Ms where we bought huge bags of M&Ms and then of course dividing them evenly by color. M&Ms now a long time favorite that was introduced to me by my grandmother. ~ Kelly from Texas