Question about Pearhead Stamp pads

I have made about 10 prints. They just get paler and less detailed, but still beautiful (especially much better than with finger paint). The 2nd-3rd one was even more beautiful than the first one.

I used the same stamp twice (baby footprint). It works really well with the black ink. Nothing rubbed off on the foot. With the blue ink, the prints didn't turn out well at all.

Xa. 14cm x 9.5cm and I only made one footprint. Maybe you could use it twice and just use a white piece of paper.