The word "蓝色" is formed through a direct and logical semantic combination. The first character, "蓝", means "blue", originating from the name of the indigo plant used to create a blue dye. This is combined with the second character, "色", which simply means "color". By placing the specific color name before the general category "color", the compound creates a precise and unambiguous term for the concept of "the color blue", much like constructing a clear label from two fundamental descriptive pieces.