Best type of hair dye for dying red hair??

hello everyone, i have a friend who really wants to change the colour of her hair, but no matter which hair dye she puts in her hair, the red stays. she has even used the pre lightener, which made her hair really blonde at the top then copper in the actual length of it lol, so she put an ash brown colour in it,... show more hello everyone, i have a friend who really wants to change the colour of her hair, but no matter which hair dye she puts in her hair, the red stays.
she has even used the pre lightener, which made her hair really blonde at the top then copper in the actual length of it lol, so she put an ash brown colour in it, and it has gone a more lighter red lol.

she is stressing at the bit, wanting to change her colour,
would it only really be the hair dyes that hair dressers use that would change the colour, or is there a specific brand of hair dye that is good with red hair?

thanks for any sensible answers.

xx
Update: thanks andy, i will be sure to tell her that lol.

she is just wanting a change of colour, she likes the more light brown colours.

thanks ladies, for your answers.
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