Colors come up in several places in children's nonfiction, but for just introducing the colors and not verging into how to use them, there isn't much that can beat a picture book. Check out one of the titles below!
A carpenter ant makes holes to peek outside his stump - but with every hole he makes, he sees a new color, and with every color he sees, he becomes more worried about the creature outside.
The little rabbits are hungry, but the soup pot is empty! Look at numbers and colors as each little rabbit looks in the garden for something tasty and colorful to put in the soup.