You can make the lightening more gradual by mixing honey with a light conditioner 2 to 1 ETA: 2 parts conditioner to 1 part honey - but - once lightened it is permanent and your roots will grow in darker and lighten as your hair "weathers" from exposure to the elements.
If as you say it is not all that noticable you may prefer to leave the colour as is considering that most people have a variance with their natural hair colour as their hair grows longer.
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