HELP...weft is too dark...can I color?

get some bleach- professional if u can or  some from the beauty supply- get 30 vol devep- mix to a creamy texture- like pudding.

take a small section, lay foil underneath it

use a brush and paint it on, covering the entire test piece.

wrap the foil around it.

let it process and watch it every five minutes. when it reaches the color u are wanting , shampoo and condition and dry. Keep track of how long it takes so IF it does work, you will know how long for the rest of it.

You could take something like a 4 inch section of the weft and try bleaching and toning it just to see what happens.....

Lightening the hair (which also means making hair 'redder') is always tricky business.

I have taken some of my #2 wefts, and used a intense high lift tint to make vivid red-violet highlights, but that is the only time I have tried to lighten hair, and certainly not the whole weft, but a few highlights.

Wefted hair is already processed, so putting on more ammonia and peroxide  is a risk.  Also, much of the hair is pre-colored, and since a tint will not lift a tint, is is possible that you can't get the lift you want without bleaching and toning the hair.

If you try it, of course do a strand test first.