What does the color yellow mean in Christianity?
Same thing as it does in English.
I believe, you mean what two colors make yellow? Well, none really, because yellow is a primary color. A primary color is a standard color, the primary colors are: red, blue, and yellow. Every color in the universe would start as a primary color, such as: blue and yellow make green or blue and red make purple. No two colors can be mixed to make a primary color, it just doesn't work. So, frankly, the…
Throughout the entire book, Fitzgerald uses the color yellow to represent not only wealth, but also corruption. Gatsby's car is yellow, the dresses of the twins are yellow, the glasses of Dr. T. J. Eckelburg are yellow. At one point, Nick even describes some flowers in his yard as "smelling yellow."