How about the scarlet letter on the blue background at the barber shop door?

It's good. The scarlet letter on the blue background at the door of the barber shop is conspicuous and unique, which will attract customers. Red also means business is booming, so the scarlet letter on the blue background at the entrance of the barber shop is very good. A barber shop is a place for hair care. Trimming hair is common, which makes people look clean and tidy, and has the function of beautifying appearance and beauty.