PENETRATING INK

Ink that contains a penetrating dye that goes into the fibers of the print-receiving material and shows through to the back of the document. It is usually used in passports and travel documents for applying numbers by letterpress printing.

PENETRATING INK1.jpg

a — Paper substrate  and polymer substrate ； 

b — Blank number. Front side. Penetrating ink; 

c —  Document number. Back side. Traces of red dye on the reverse side of the print. Oblique light; 

d, e — Zoomed fragment. Front (d) and back (e) side of the print. Letterpress；

PENETRATING INK2.jpg

a — Paper substrate; 

b, c — Blank number (b). Zoomed fragment of the symbol (c). Penetrating ink. Letterpress


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