I have coloured my hair platinum blonde, blue, dark blue and now black.
Im happy with the black but I would like to dye the underneith platinum blonde so that I can dye it blue underneith (semi permement blue, which doesn't harm hair).

Will my hair just fall out or go coppery :(
If I dye it and it goes coppery, then wait a week, and dye it again and so on, will it eventually go blonde?

Is there anyway I can do this at home, I cannot afford a salon.
I have already bought 2 packs of platinum blonde hair dye, LIVE Schwartzkopf, it contains bleach.

Help please!