I don't think a white on white batik is possible. There wouldn't be any contrast. I needed a while batik for a quilt backing and found some at Hancock's, but they were waiting for a shipment that never came. I found something that would work on another site and it worked great, but there was a little gray worked in. Very light as I was afraid it would change the front that has an off-white background fabric. I was afraid the color would show through. It didn't. Oh yes, I needed extra wide fabric.
Sue