Knowledge / Separation Methods / Perforations / Mistakes

Perforation mistake: printers term for a deviation caused by a perforation mistake

Missing perforation: postage stamp with not executed perfor-ation caused by mistake (imper-forated)

Partly missing perforation: postage stamp with partly not executed perforation caused by mistake

Missing perforation hole: perforation with broken tooth needle and therefore a hole is missing in the perforation line caused by mistake

Perforation size mistake: printers term for a deviation from the intended perforation size caused by mistake

Perforation number mistake: philatelic term for a deviation from the intended perforation number caused by mistake

Partly perforation number mistake: philatelic term for a partly deviation from the intended perforation number caused by mistake

Fluctuating number of teeth: postage stamp with uneven distance between the teeth caused by mistake

Fluctuating perforation holes: postage stamp with the perfor-ation holes do not stay in line caused by mistake

Shifted perforation: postage stamp with shifted perforation to another position as intended caused by mistake

Badly centered perforation: postage stamp with shifted per-foration which is extended over multiple sheet positions caused by mistake

Inverted perforation: postage stamp with 180 degrees rotated perforation caused by mistake

Double perforation: postage stamp with twice instead once perforation caused by mistake

Partly double perforation: postage stamp with partly twice instead once perforation caused by mistake

Albino perforation: postage stamp with not fully punched out perforation holes but only slightly pressed in caused by mistake

Partly albino perforation: postage stamp with partly not fully punched out perforation holes but only slightly pressed in caused by mistake

Oblique perforation: postage stamp with the perforation lines are not aligned parallel to the design print caused by mistake

Oblique perforation: postage stamp with the perforation lines are not aligned parallel to the design print caused by mistake

Rough perforation: postage stamp with imperfect perforation were provided with paper residue in the perforation holes caused by mistake