On July 1, 2014, USCIS began using a new, secure blue ink for many of its secure stamps. On that date, the older secure red ink was retired and no longer used. USCIS stamps with this secure blue ink include the DHS Parole Stamp; I-551 Alien Documentary Identification and Telecommunication Stamp; Refugee Stamp; Asylum Stamp; and Initial/Replacement I-94 stamp.
The standard black ink will continue to be used on the following stamps: Approval Stamp for Applications Received; Denial Stamp for Applications Received; Director’s Signature Stamp for Certificates of Naturalization and Citizenship; and other similar USCIS documents.