Here's a breakdown of the code:
* 9: Represents the level of lightness. 9 is a very light blonde, almost platinum.
* G: Indicates the undertone. "G" stands for "gold."
So, 9G hair color is a light blonde with a warm, golden hue. It can range from a soft, buttery blonde to a brighter, more vibrant gold, depending on the specific brand and formulation.