Is the natural black with grey half and half not mixed together? And can I somehow jut grey bulk hair that isn't halved or mixed with another color?

No, but funny enough, I just used the 27 afro bulk for a demo on how to get silver gray hair. You can use Special Effects (any blue but blue velvet) and dilute it down. Just a few drops of color into conditioner, mix well and put on the hair. If it doesn't tone it enough, keep adding slightly more blue until it becomes a light silver. :)
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