ionic: Color

src/theme/variables.scss

In here define your colors inside $colors map:

$colors: (
  primary:    #488aff,
  secondary:  #32db64,
  danger:     #f53d3d,
  light:      #f4f4f4,
  dark:       #222,
  ...
  myColor: #ff0000,
);

custom_scss.scss

.my-class {
...
background-color: color($colors, myColor);
}