Manic panic hair dye?

I have really dark, almost black hair with diy ombre at the bottom where it's a light brown almost ginger. I love it but I fancy something a little brighter and I want to stop using cruel products so I can't reuse L'Oréal to get the same effect again. I've heard a lot about Manic Panic with celebrities using it but I'm not sure yet, has anyone tried it? Does it have any effect on dark hair? I'm scared the bottom of my hair where it's kinda ginger wouldn't take it well because of the colour? My hair is pretty long and I'd only dip dye, I don't want those chemicals on my scalp, so I wouldn't mind chopping it all off if it went badly haha

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