What color palettes are commonly used in retro comic art?

Common palettes include limited primary colors (red, yellow, blue) with black and white, often used in CMYK separations. Earth tones like browns, greens, and oranges were also prevalent, especially in the Golden Age. Silver Age often incorporated brighter, more saturated colors, but still maintained a relatively limited range compared to modern comics. Researching specific comic books from the era you're emulating is key.