kaneki tokyo ghoul white hair

I'm curious about their hair changing. Like Kaneki when Jason tortured him and Juzo's hair in :re bacame black and Arima's blue hair became white. In the manga at some point it's explained that when half ghouls/quinx body goes through more than it can handle it triggers the "ghoul transformation" (like kaneki with Jason), it makes the amount of ... paito tokyo 4d