What color were original peanut M&M's?

M&M's (styled as m&m's) are "colorful button-shaped chocolates" produced by Mars, Incorporated. The candy shell, each of which has the letter "m" printed in lower case on one side, surrounds a filling which varies depending upon the variety of M&M's. The original candy had a milk chocolate filling which, upon introducing other variations, was branded as the "plain" variety. "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. Numerous other variations have been introduced, some of which are regular widespread varieties (such as "peanut butter", "almond", "pretzel", "crispy", and "dark chocolate") while others are limited in duration or geographic availability.

Peanut M&M's were introduced in 1954 but first appeared only in the color tan. They were debuted at the same time as the tagline "Melts in your mouth, not in your hand." In 1960, M&M's added the yellow, red, and green colors.