Would this work?

Ok so my hair has got blond, red, black , and my natural color in it now

Most of the black is out

& I bought dye that was my orgianl hair color
Would it dye it completley without showing anyother colors
Or would I have to bleach it first???

I think you may need to blech it because of hte black but it may work

If the color you choose is darker than the darkest part of your hair, it will work. That's the only way. So if part of your hair is black, you would have to put on black color to cover it.

Ignore the above answers, only way to completely COMPLETELY get rid of the colours is to bleach it out then re dye it with your natural colour. You'll have to keep topping it up every month or so as it will fade back to the bleached colour but it is the only way to do it. Trust me lol I've learnt from experience

GO TO WALGREENS OR CVS THEY HAVE THIS PRODUCT CALLED Color Oops AND ITS A GREAT PRODUCT IT WILL REMOVE YOUR COLOR HAIR DYE, AND THE GOOD THING ABOUT THIS IS THAT YOU CAN COLOR THE SAME DAY.