What is scale-color() function good for in Sass?

The scale-color() function allows to fluidly scale different color properties.

The following color properties can be modified:

• $red - color red channel
• $green - color green channel
• $blue - color blue channel
• $saturation - color saturation
• $lightness - color lightness
• $alpha - color alpha channel

$color: red;
.color1 {
  background: scale-color($color, $red: 10%);
}

.color2 {
  background: scale-color($color, $lightness: -30%);
}

.color1 {
  background: red;
}
.color2 {
  background: #b30000;
}