Step 1: Spread out the leather with the ballpoint pen printed on it.
Step 2: squeeze a little toothpaste on the mark.
Step 3: Wipe evenly by hand.
Step 4: Take a bar of soap and dip it in some water.
Step 5: Apply soap to toothpaste.
Step 6: Gently wipe the impression with a foam brush.
Step 7: Remove the traces of the original ballpoint pen.