Bleed Through Ink is Ink that produces a red halo around serial numbers that penetrates through the document for easy verification.
The reverse image of the serial numbers should appear on the back of the document. This type of verification is limited in online and mobile ID authentication since examination is based on a photographed or scanned image of the ID document and not the original.
Ref.: http://www.isdausa.com/uploads/Security_Glossary.pdf