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hi, so i decided to bleach my hair at home with help from a friend, i used a 30 vol developer and applied it everywhere apart from the roots, then i went back a little later and did the roots.

it turned out extremely patchy, most of the top layer of my hair didn’t lift at all but closer to my hair is extremely light. i want to go back in and bleach the parts that didn’t lift but i’m worried it just won’t lift again

what should i do to fix this? it looks awful :( thank you