Another piece of potato paper

I used a regular sheet of card stock this time and
sprayed it with Eggplant Color Wash. Let that dry (I think if it had
been bone dry there would have been more white ares), then squirted on
the potato. Baked that until it cracked and was dry to touch. Then I
bravely sprayed bleach over the entire surface and watched magic
happen! I used a soft rubber edged kitchen scraper to remove the potato
after the bleach had dried. It came right off! I just brushed away the
crumbs with a paper towel and got a great piece of paper.
I'm wondering about neutralizing the bleach so the paper will
be "friendlier"?