A photocopier costs a few hundred dollars, a laser printer even less, and a scanner is built into most phones. There is no practical reason in the 2020s to use carbon paper for its original purpose — making a duplicate of a typed document — and yet the paper is still manufactured, still sold, and still worth understanding. It is one of the small technologies that a typewriter owner encounters, uses briefly, and finds unexpectedly satisfying.

This is a short manual for using it well.

What carbon paper is

A sheet of carbon paper is a base sheet — usually a thin, hard, calendered paper — coated on one side with a mixture of wax, oil, and pigment. The pigment is nearly always carbon black, though blue, red, and specialty colours exist. The coating is designed to release pigment under pressure and only under pressure: rubbing a fingertip across the surface transfers very little, but a typewriter keystroke transfers a sharp, clean impression.

Three grades exist in modern production.

• Standard weight. The general-purpose grade, roughly comparable to mid-century office carbon. Good for two to four copies.
• Thin (or duplicating) weight. Lighter base sheet, releases pigment more freely. Used when making more copies in one pass — up to seven on a good machine. The copies below the second are faint but readable.
• Film carbon. Plastic film base with a solvent-based coating. Sharper transfer, more copies per sheet, longer life. Overkill for occasional use but common in professional settings where carbon paper is still used routinely (some legal environments, some carbon-copy invoicing systems).

Setting up a carbon sandwich

The stack you feed into the typewriter runs, from front to back:

1. Original — clean white paper, this is the sheet you keep. 2. Carbon sheet — coated side facing away from the original (toward the copy). 3. Copy — the sheet that will receive the transferred image. 4. Second carbon (optional) — coated side facing away from the first copy. 5. Second copy (optional) — the sheet that receives that transfer. 6. Repeat as needed.

The coated side of the carbon must always face the sheet that will receive the copy, not the sheet above it. This is the most common beginner's error: a carbon sheet fed with the coated side up produces two blank sheets and a faintly stained original.

The whole stack rolls into the typewriter as one unit. Feed it in slowly and align at the top. Once the front edge is under the platen, the paper release and margin stops handle the rest.

Adjusting typing pressure

Making multiple copies requires more keystroke pressure than a single sheet. On a manual portable, this means typing with slightly more force than usual — a firm, positive stroke rather than a light one. On a standard office machine, the difference is barely perceptible; standards were built with extra pressure margin for exactly this reason.

Electric typewriters usually have a stroke-pressure control. Set it toward the harder end when making carbons; return it to normal when typing single sheets.

If the copies are too faint, more pressure will improve them, but only up to a point. Beyond that point the original starts to look bruised — the type impression cuts a visible relief into the paper — and image quality on the copies plateaus. If you cannot get a readable third copy without over-pressing, add a thin sheet of typewriter paper between the second carbon and the third copy. The extra bulk in the sandwich increases the effective pressure on the lower sheets.

Correcting on a carbon set

Correcting typed errors on the original is straightforward: white correction fluid or a correction tape, as normal. Correcting on the copies is harder, because the pigment sits between the paper fibres rather than on top. Fluid corrections on a carbon copy look grey rather than white; correction tape lifts some of the transferred image and looks smeary.

The traditional approach — still the best — is to type the correction on the original with the carbons in place, so the correction is transferred through the stack. This requires you to catch errors immediately. For older errors on carbon copies, retype the page from the beginning; carbon copies are not meant to be corrected retroactively.

Storage and reuse

A carbon sheet can be reused many times before its transfer becomes too faint. Twenty passes is easy; fifty is achievable with the better modern grades. When retiring a sheet, do so before it starts to produce ragged edges on the copies — a worn sheet slurs the letterforms even when the transfer intensity is still adequate.

Store carbon paper flat, in a folder, away from heat and direct light. The wax coating softens above about 30 °C and will offset onto adjacent surfaces if the paper is stored in a hot desk drawer. In the humid tropics, keep carbon paper in a sealed envelope with a silica gel packet.

Why bother

The photocopier makes better copies faster than any carbon set. The photocopier also destroys the direct link between the original and the copy: the copy is a scan, a rendering, a translation. A carbon copy is the same keystroke, the same instant, mechanically transferred through paper. For personal correspondence, for signed letters where the writer wants a genuine record, for the pleasure of using the tool the way it was meant to be used, carbon paper remains the correct choice. A drawer of typed carbon copies from a well-kept correspondence looks and feels like an archive in a way that a folder of photocopies never quite does. That difference is small but real, and it is what keeps the mills running.