Carbonless copy paper (CCP), non-carbon copy paper, or NCR paper is an alternative to carbon paper, used to make a copy of an original, handwritten (or mechanically typed) document without the use of any electronics. The process was invented by chemists Lowell Schleicher and Barry Green, working for the NCR Corporation, as a biodegradable, stain-free alternative to carbon paper. Early product literature piggybacked on NCR's corporate name by calling the paper No Carbon Required paper, a simple bacronym alternative to National Cash Register.
Carbonless copy paper works in a fairly simple way. It consists of sheets of paper that are coated with micro-encapsulated dye or ink and/or a reactive clay.
The back of the first sheet is coated with micro-encapsulated dye. The lowermost sheet is coated on the top surface with a clay that quickly reacts with the dye to form a permanent mark. Any intermediate sheets are coated with clay on top and dye on the bottom.
When someone writes on the sheets, the pressure from the point of the writing instrument causes the micro-capsules to break and spill their dye. Since the capsules are so small, the print obtained is very accurate.
Similarly, the paper can be used in dot-matrix and impact printers, where the striking head releases dye to interact with the clay.
Carbonless copy paper was also available in a self-contained version that had both the ink and the clay on the same side of the paper.
Carbonless Copy Paper, more commonly known in the printing industry as NCR Paper (No Carbon Required) was first produced by the NCR Corporation. Before this the only option was to write documents more than once or use messy Carbon paper which was inserted inbetween the sheet being written on and the required copy below, often ending up with the user having blue fingers. The invention of NCR Paper made duplicating, triplicating and even quadruplicating hand written and printed documents easy and clean.
NCR Paper is commonly used for Invoices, Receipts and any other document where duplication is required. There is an array of colours available such as white/yellow/pink/green/blue, in most instances white is the top copy and subsequent colours are beneath dependant on the number of duplicated pages required. For example; If you require 2 copies of a document being written/printed, you would have a white top part and 1 coloured second part below, this is called 2 Part or Duplicate. For 3 copies, you would have a white top part and 2 coloured parts below, this is called 3 Part or Triplicate. For 4 copies, you would have a white top part and 3 coloured parts below, this is called 4 Part or Quadruplicate.
NCR Paper is usually supplied to the end user collated into Pads/Books which are bound into sets using glue or staples, Loose Sets or Continuous Forms are also widely used for use in printers. 
Dyes and chemicals
The first dye used commercially in this application was crystal violet lactone, which is still widely used today. Other dyes and supporting chemicals used are PTSMH (p-toluene sulfinate of Michler's hydrol), TMA (trimellitic anhydride), phenol-formaldehyde resins, azo dyes, DIPN (diisopropyl naphthalenes), formaldehyde isocyanates, hydrocarbon-based solvents, polycyclic aromatic hydrocarbons, polyoxypropylene diamine, epoxy resins, aliphatic isocyanates, Bisphenol A, diethylene triamine, and others. The dyes in carbonless copy papers may cause contact dermatitis in sensitive persons. Health and environmental concerns
Until the 1970s, when the use of polychlorinated biphenyls (PCBs) was banned due to health and environmental concerns, PCBs were used as a transfer agent in carbonless copy paper. PCBs are readily transferred to human skin during handling of such papers, and it is difficult to achieve decontamination by ordinary washing with soap and water. In Japan, carbonless copy paper is still treated as a PCB-contaminated waste.
Exposure to certain types of carbonless copy paper or its components has resulted, under some conditions, in mild to moderate symptoms of skin irritation and irritation of the mucosal membranes of the eyes and upper respiratory tract. However, a 2000 review found no irritation or sensitization on contact with carbonless copy paper produced after 1987.  In most cases, good industrial hygiene and work practices should be adequate to reduce or eliminate symptoms. These include adequate ventilation, humidity, and temperature controls; proper housekeeping; minimal hand-to-mouth and hand-to-eye contact; and periodic cleansing of hands.
The University of Florida has found that chronic exposure to carbonless copy paper can be hazardous to a person's health. Scientists there found higher rates of sick leave and illness complaints at the office using large amounts of carbonless copy paper. Furthermore, a study published in Environmental Health Perspectives provides new evidence that exposure to paper dust and carbonless copy paper in office work are related to increased risk of adult-onset asthma.
The average carbonless copy paper contains a high concentration of Bisphenol A, an endocrine disruptor.
In 2001, three employees of a medical center in San Francisco filed a lawsuit against their employer, blaming exposure to carbonless copy paper and other chemicals for their inflammatory breast cancer.
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