Print-through

Not to be confused with bleed-through.

Print-through is a generally undesirable effect that arises in the use of magnetic tape for storing analog signals, in which a signal recorded on one section of tape is transferred onto other sections in close proximity. It is caused by the pattern of magnetic fields recorded on the source tape influencing the ferromagnetic particles in adjacent tape to align with the source.

Print-through is experienced as an unintended artefact when audio recordings are stored on reels, with layers wound closely together, causing pre- and post-print echoes on playback. After the advent of videotape, the mechanics behind print-through were applied to quickly duplicate tapes. In the context of videotape duplication, print-through is more often referred to as contact recording or contact printing.

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