If you use a pure, saturated Red (warm) next to a pure Green (cool), the line where they meet will actually hurt the eyes (vibrancy effect).
Open your design tool. Pick a rectangle on the wheel. Remove 50% saturation from two of the colors. Watch the magic happen. Need help finding the perfect rectangle? Try using the "Tetradic" tab on Adobe Color or Coolors.co to generate instant palettes. tetradic
Enter the (or Double Complementary) color scheme. If you use a pure, saturated Red (warm)
It sounds scientific, but don't let the name scare you. A tetradic scheme is simply two pairs of complementary colors. Imagine a rectangle on the color wheel: Orange/Blue and Yellow/Purple. Four colors. Infinite possibilities. If you use a pure