In the Collins, the word "color" itself is countable. In one article which talks about countable and uncountable, the author says "colors" is uncountable. I think the "colors" in the article means specific color such as red, yellow. These words are uncountable. Here comes my question. If I want to ask what's the color of two dogs, Which one is right, color or colors? Please help.
"What is the color of those two dogs?"
Both dogs have the same color.
"What color are those two dogs?"
Both can have a different color, but most likely one color each.
"What colors are those two dogs?"
Both dogs may have the same colors or different colors, but they have several colors each, or at least one of them does.
"What are the colors of those two dogs?"
Both dogs can have the same multiple colors or each be of (a) different color(s).
"Leaves are different shades of brown and red in the fall."
"The reds and browns of the woods in the fall."
As for the names of the colors themselves, they can be countable and uncountable. To differentiate them, you can use "shades" for instance.