US Tagging Types

Mark Stockburger - Administrator
Al Gore - Contributor



Type Description
AC Phosphored ink - Taggant mixed with ink ("Added to Color").
Block Taggant block covers most of the face of the stamp. Block is always centered on design.
Grainy Solid Prephosphored coated paper, with surface tagging
Hi-Brite Paper glows bright white under SW & LW UV
Horizontal Band Taggant cover a horizontal band across the face of the stamp. 
Large Block Taggant block covers most of the face of the stamp. Block is not centered on design.
Mottled Prephosphored uncoated paper
Narrow Block 5½-6½mm gutter between tagging blocks
Overall Taggant covers entire stamp, one of the most common tagging types.
Prephosphored Paper
Small Block
Solid Prephosphored coated paper, with surface tagging
Surface Phosphor
Tagged BPC
Uneven Prephosphored coated paper, with surface tagging
Untagged
Vertical Bar Tagging vertical bar 13mm wide
IT Only the stamps Images are Tagged, or untagged for the two early IT examples. The tagging, or Jack of tagging, follows the contours of the stamps image. Tagging was added after the images were printed for the Glass stamps. The remainder of the stamp is untagged. This untagged area allows for better absorption of the canceller ink, which helps prevent erasure of the cancel. Other than this security feature, block tagging serves the same purposes as IT tagging and it's simpler to set up.
Wide Block
Wide Tall Block .