Good to keep your color fresh

I have been coloring my hair purple for more than 2 years. I color about every 6-8 weeks but color isn't staying in my hair as long as it use to due to a lot of gray hair, lol. This is helping my purple stay bright and fresh looking. I do use conditioner after shampooing to prevent tangles since I have baby fine, thin hair. Even after going on a cruise and my hair being subjected to salt water and chlorine, the color has stayed fresh with this.

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