What is the longest lasting hair coloring product for men?

Marriage the gray hair expert.What is the longest lasting hair coloring product for men?
I think it would be the same for men as for women. There are however some things you should keep in mind if you want to make your hair color last longer: http://www.hairfinder.com/tips/hair_colo鈥?/a>What is the longest lasting hair coloring product for men?
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