Does it give a purple tint to hair?

Not at all. It just makes your hair brighter.

Does this shampoo brighten the gray in salt and pepper hair? Does it have any effect on the dark hair?

Hi Darnell, yes it would brighten the gray hair in your salt and pepper hair. It won't affect the dark hair. The Silver Fox shampoo is specifically designed for grey, bleached, highlighted hair. That does not mean all your hair has to be grey or blonde. It will do just the same on the grey strands of hair or bleached highlights. Hope this helps.

Its has Phenoxyethanol in it , what is that and is it safe in a shampoo ?

Used as an anti-bacterial in cosmetics and stabilizer in perfumes, phenoxyethanol is actually very harmful. It is harmful if swallowed, inhaled or absorbed through skin, especially to nursing mothers or infants. ... It irritates skin and eyes, and can cause blistering on skin as well.

is there extra body conditioner

Hi Marjorie! Silver Fox Conditioner is regular, not extra body, but it comes in 2 sizes-12 oz and 16 oz. Only Silver Fox shampoo comes in regular and extra body.