1971: CC and BCC: How Carbon Paper Created Email's Most Used Fields

Two of the most used fields in every email client — CC and BCC — carry names that reference a technology most people under 40 have never touched. Carbon copy paper: thin, waxy, ink-coated sheets that created duplicates of typed or handwritten documents. The technology was invented over two hundred years ago, dominated office life for over a century, and disappeared almost completely by the 1990s. But its nomenclature lives on in every email sent, a linguistic fossil embedded in modern communication.

The Carbon Paper Era

Carbon paper was patented in 1806 by Ralph Wedgwood, an English inventor who originally designed it to help blind people make copies of letters. The concept was simple: a thin sheet of paper coated on one side with a layer of ink (originally a mixture of carbon black and wax) was placed between two sheets of regular paper. When you wrote or typed on the top sheet, the pressure transferred the ink from the carbon paper to the bottom sheet, creating a duplicate.

The technology found its true calling with the rise of the typewriter in the late 1800s. Office workers could produce multiple copies of a document simultaneously by stacking several sheets of paper with carbon paper between each pair. A typist creating a letter with three copies would build a sandwich: original paper, carbon sheet, copy paper, carbon sheet, copy paper, carbon sheet, copy paper. The typewriter keys struck through the entire stack, producing an original and three “carbon copies.”

The phrase “carbon copy” entered the business lexicon as standard terminology. When a business letter was sent to a primary recipient with copies to others, the bottom of the letter would include the notation “cc:” followed by the names of the copy recipients. This notation told the primary recipient who else had received the document — a matter of transparency and professional courtesy.

The “Blind” Copy

The blind carbon copy — BCC — was the sneakier cousin. In the physical office, creating a blind copy meant producing the carbon copy but removing the “cc:” notation from the original before sending it. The primary recipient would have no way of knowing that copies had been made and sent to others.

Blind copies served various purposes, not all of them nefarious. A manager might BCC a file clerk to ensure a copy was archived without cluttering the letter with administrative notations. An executive might BCC a lawyer on a sensitive communication for legal documentation. And yes, sometimes blind copies were used for office politics — keeping someone informed without the other party knowing.

The practice was common enough that “bcc” became standard notation in office correspondence, even though its whole purpose was to be invisible in the final document sent to the primary recipient.

The Jump to Email

When electronic mail systems were developed in the 1970s, their designers modeled the addressing fields on existing office correspondence conventions. The “To” field corresponded to the primary recipient of a letter. The “CC” field corresponded to the carbon copy notation. The “BCC” field corresponded to the blind carbon copy.

Early email systems on ARPANET and university networks adopted these conventions almost immediately. The terminology was familiar to the office workers who were the primary users of early email. Even though electronic copies didn’t involve carbon paper — the copy was just another identical digital message — the naming convention stuck because it accurately described the social function: CC means visible copy recipients, BCC means hidden copy recipients.

RFC 733, published in 1977 as one of the early standards for ARPANET mail message format, included both CC and BCC as standard header fields. By the time email reached mainstream consumers in the 1990s, CC and BCC were entrenched features of every email client.

The CC Culture

CC became deeply embedded in workplace email culture — sometimes productively, often not. The ability to copy anyone on any email with a single click created behaviors that would have been impractical in the carbon paper era, when creating extra copies required physical effort.

“CYA CC” became a recognized workplace pattern: copying your manager, your manager’s manager, or half the department on an email to create a paper trail proving you had communicated something. The practice generated enormous volumes of email that recipients didn’t need and didn’t read, contributing significantly to the email overload that plagues modern offices.

Some organizations attempted to establish CC policies — guidelines for when copying someone was appropriate versus when it was performative. Few succeeded. The CC button was simply too easy to click, and the perceived risk of not copying someone (they might miss something important) always felt greater than the cost of copying them unnecessarily (they could just ignore it).

BCC’s Privacy Role

While CC became a productivity challenge, BCC evolved into an essential privacy tool, particularly for email marketing. When sending to large groups, using CC exposes every recipient’s email address to every other recipient — a significant privacy violation and a gift to spammers who could harvest the addresses.

BCC solves this by hiding each recipient’s address from the others. Email newsletters, company announcements, and group communications use BCC (or more commonly now, dedicated email marketing platforms that handle recipient isolation automatically) to protect subscriber privacy.

The failure to use BCC has caused numerous embarrassments. In 2003, a UK government employee accidentally used CC instead of BCC when emailing a list of people who had applied for jobs in intelligence agencies, exposing the identities and contact information of secret intelligence applicants to every other applicant on the list. Similar incidents have occurred in corporations, universities, and government agencies worldwide.

Modern Confusion

Despite being standard email features for nearly fifty years, CC and BCC continue to confuse users. Surveys consistently show that a significant percentage of email users don’t fully understand the difference between CC and BCC, and many have never used BCC at all.

Part of the confusion stems from the terminology itself. “Carbon copy” is meaningless to anyone who hasn’t used a typewriter, and “blind carbon copy” is doubly opaque. Some email clients have experimented with more intuitive labels — “visible copy” and “hidden copy,” for instance — but the CC/BCC convention is so deeply established that alternatives haven’t gained traction.

The other source of confusion is the social ambiguity of CC. Being CC’d on an email carries an implicit message: “you should know about this, but you’re not the primary audience.” But what exactly that means — whether you’re expected to read, respond, or simply be aware — varies by context, organizational culture, and individual interpretation. The carbon copy notation on a typed letter was simple: here’s a copy for your files. The CC on an email is loaded with ambiguity about expectations and social dynamics.

The Immortal Metaphor

CC and BCC are arguably the most durable metaphor from the pre-digital office. Other office terminology has faded: nobody says “Rolodex” anymore, “filing cabinet” is increasingly metaphorical, and “fax” is almost archaic. But CC and BCC persist because the functions they describe — visible copies and hidden copies — remain fundamental to how email works.

Every email sent today carries the DNA of carbon paper and typewriter culture. It is a small, persistent reminder that new technologies don’t always invent new language — sometimes they inherit the vocabulary of what came before, long after the original meaning has been forgotten.

Infographic

Share this visual summary. Right-click to save.

Frequently Asked Questions

What do CC and BCC stand for in email?

CC stands for 'carbon copy' and BCC stands for 'blind carbon copy.' Both terms originate from the use of carbon paper in typewriters and manual writing, where a sheet of carbon paper was placed between two pages to create a duplicate. In email, CC sends a copy to additional recipients who are visible to all, while BCC sends a copy to recipients whose addresses are hidden from other recipients.

When was carbon paper invented?

Carbon paper was invented in 1801 by Ralph Wedgwood, an English inventor, and patented in 1806. It was originally designed for use by blind people to create copies of handwritten letters. The technology became widely adopted in offices with the rise of typewriters in the late 1800s and remained standard office equipment until photocopiers and printers replaced it.

When should you use BCC instead of CC in email?

BCC should be used when sending to large groups where recipients don't need to see each other's email addresses (protecting privacy), when introducing someone via email without exposing the third party's address, and when you want to keep a copy for documentation without alerting the primary recipient. BCC is essential for email marketing to prevent exposing subscriber lists.