Originally Posted by BatScot
The comparison here is invalid—no reasonable person would argue a symbolic relationship between yellow and red. However the idea that “blue is symbolic of black” is reasonable in terms of both comic convention and textual evidence.
Sure, but it the absurdity of the comparison isn't really important. Insert a less absurd substitute for red and yellow if it makes a difference to you; the point will remain the same. Blue is blue regardless of what I'm someone, somewhere may or may not have expected me to imagine it as.
Maybe it would drive clarity if I had your answer to this question: is the blue symbolic of black in the image below?