It's the contrast, not the color

CXL goes deep on whether colors make a difference in getting online viewers to click:

“No single color is better than another. Ultimately, what matters is how much a button color contrasts with the area around it.”

— Ott Niggulis

Nicely debunks of the pseudoscience of color psychology. With an in-depth discussion of A/B tests on colors. Worth reading the whole thing.