How do I remove black dye from a brown wooden floor?

Have you tried peroxide?

Try washing it with dish detergent, a little baking soda and warm water. Anything else may damage the surface.

You would have to sand it down

There are products like goof off, just read the label and maybe test it in a place where you won’t see as much if it’s not right.

I really think you will need to sand it down.

Amolina,. You might have to sand it and then restain it. Old English has stains in 2 colors. Light and dark. You probably need the dark but I'd start with the light, and see how it comes. Aloha!