What is the rarest m&m color?

The rarest M&M color is believed to be brown. The reason for this is that brown M&M's were actually retired in 1995 due to consumer preferences and replaced with blue. However, the color was brought back in 2008 due to popular demand.

Brown M&M's are less common in packages than other colors such as red, blue, and green. This scarcity has led some collectors to value brown M&M's more highly than other colors.

Overall, the rarity of brown M&M's adds to their appeal among collectors and fans of the candy brand.