Hi! I use Superior Preference Whisper Soft Blonde and want to go back to a color closer to my natural hair color which is medium brown. Can I do that using a brown shade of Preference or will the color be off too much since I have been coloring my hair blonde for so long? Thank you so much!

You will have to allow for the porosity of your hair from constantly coloring it.

Pick a brown shade two or three shades lighter then you original color.