I meant digitally. I assumed they did some kind of 3D MRI type scan. If you do that, you can easily pull off upper AND lower layers.
I'm not sure how an x-ray can make paint #1 appear but paint #2 invisible - so I guess I'm missing something.
I'm not sure how an x-ray can make paint #1 appear but paint #2 invisible - so I guess I'm missing something.
Although you do bring up an interesting idea, you could remove the top layer by subtracting the visible portion from the xray.