Black to Blonde in One Day Safely

I used keratin oil. You can use tea tree oil or coconut oil also. This helps to prevent further damage to your hair. Keep the oil in your hair while applying bleach and throughout the bleaching process.

I used Splat bleach. It works better than any other box and professional bleach I have used. Cover the area you want to bleach with it and wait the designated amount of time.

Wash the bleach out of your hair.

If your hair is still dark you can bleach again, Id suggest waiting at least a day and do a deep conditioning first.
I did mine in the same day because Im inpatient.

After bleaching your hair will likely be orange tinted. You can buy purple shampoo or conditioner.
Or you can make your own.
Just mix a tiny drop of purple and/or blue food coloring or hair dye in conditioner and/or shampoo.

https://youtu.be/CAdAcpwLwo8
Here is the video.