Which hair dye product/brand best covers up grey/white hair?

covers grey/white hair so that it blends in with the dyed hair color and does not look lighter than the rest of the hair?

Which hair dye product/brand best covers up grey/white hair?

I found something at Sally Beauty called "Gray Magic". It's a liquid in a small plastic bottle, and you add drops of it to a portion of your hair color and apply that to the resistant gray areas first, then color the rest of your hair normally. I have found that the product really helps the color get into the gray hairs. Gray is really hard to penetrate with color. This was inexpensive and really works well. I've not found any consumer hair "dye" product, even permanent coverage L'Oreal, which my hair dresser says is the best, that works well for gray hair, but the Gray Magic + L'Oreal does it for me.

PS If you Google for Gray Magic, you will get info on it. It's a concentrated color additive.

Which hair dye product/brand best covers up grey/white hair?

To check graying of hair, mix lemon juice in olive oil, beat till frothy and apply on scalp and wash off after an hour. Premature graying of hair can be postponed by using a strong decotion of black tea and a tablespoon of salt, strain and apply to the roots for 45 minutes and wash with water. Don't shampoo. Please check out http://useinfo-grayhair.blogspot.com/ for more info.