Why does Ciri have white hair? Since she didn't undergo the mutation process.

[Jerryo]

But then there are other Witchers, who still have their normal hair color.

[WolfEisberg]

Getting white hair as a Witcher is not a guarantee thing to happen when going through the mutation process.

Ciri has Ashen hair because she was born like that.

[deidian]

Ciri's ashen-flaxen hair is genetics into play. Is a trait in her bloodline same as her green emerald eyes.

Geralt's white hair is because he was subjected to experimental mutations which made him loose his natural hair pigmentation.

[kx_tq]

As others have said Ciri's hair color is due to genetics.

Though to add to Geralt's white hair, it seems to be an unexpected side effect of his genetics and the chemicals used in the Trail of the Grasses. In the first game I think it is Lambert has a line talking about seeing Geralt's hair turn white during the trails. He is often called the 'White Wolf' being a Witcher from the wolf school and having white hair. If white haired Witchers were common than it is unlikely he would be called this since a lot of Witchers would be "White <insert School animal>'. I haven't read all of the books yet but I haven't heard about another Witcher even having white hair other than very old Witchers like Vesemir.

[Nk Servis]

It's because she underwent a lot of stress as a kid

[[N63] chrisragnar]

Ciri is the first Witcher that does not go thrue the trial of grasses if im not misstaken.

[Jerryo]

Originally posted by INFINITE UNIVERSES:

It's because she underwent a lot of stress as a kid

I can image that, with her fu.cked up father Emhyr.