Use cooler colors for acidity, such as light yellow, light green, turquoise and so on.

Sweet with warm colors, such as bright red and orange.

Try to use darker and grayer colors, such as coffee, grayish black and so on.

Spicy food uses very warm colors, such as red, crimson and so on.

Anyway, it's right for you to think it's bitter and sweet. In addition, physical coordination is also very important.

Supplement: Then buy a lemon or orange and cut it in half. Then I looked at it and thought it was ok to paint it with color. That's what I did.