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Impact
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Impact receipt printers are capable of printing "carbon" copies of documents using special NCR (no carbon required) papers. If you need more than one copy of a document (such as a receipt), you will need an Impact printer. Impact printers are significantly slower and significantly more noisy than thermal printers.
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Thermal
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Thermal receipt printers are capable of printing only on thermally treated (heat sensitive) paper. Thermal paper receipts are susceptible to the background going dark grey if the paper is exposed to heat or strong direct sunlight and will be easily marked if the paper surface is rubbed with, say, a fingernail. Thermal printers are significantly faster and significantly less noisy than impact printers.
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Ink Jet
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Ink Jet receipt printers are capable of printing on plain paper and some ink jet printers ahve a black ink cartridge and a colour ink cartridge (red, blue or green) which is very useful if you wish to add colour to your receipts or dockets. If you do require two-colour receipts, an ink jet printer is significantly less expensive to run in terms of comsmable costs than using an impact or thermal printer (thermal printers that are capable of prining in two colours require very expensive special thermal paper.
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