Which hair dye product best for dyeing few (<20%) strands of grey hair? Pls specify US brand name

Are the products meant for highlighting hair best for this purpose?

Which hair dye product best for dyeing few (%26lt;20%) strands of grey hair? Pls specify US brand names.?

Some gray is resilient and will not cover with home coloring products. I have this type and NOTHING works. However, the best I have tried is the Clairol Nice 'n Easy Gray Solutions. I have also heard that you should go one shade lighter than your natural color.

Which hair dye product best for dyeing few (%26lt;20%) strands of grey hair? Pls specify US brand names.?

herbatint definately covers grey