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A wax seal on the back of an envelope is one of the oldest small ceremonies of correspondence. Its purpose in earlier centuries was practical — the wax secured the flap and its impression identified the sender, both a signature and a security measure — and its purpose now is essentially the same, minus the security. A letter closed with wax reads as considered. A wedding invitation closed with wax reads as ceremonial. A modern envelope, run through a modern postal system, receives its wax seal with only occasional damage — and modern flexible sealing waxes have been developed specifically to survive the journey. This is a guide to what you actually need, what to buy, and how to make a proper seal.
What Sealing Wax Is
Traditional sealing wax is not, and never was, actual beeswax — it is a compound of shellac, resin, and colouring pigment, hard at room temperature, which melts at a moderate temperature to a liquid that flows briefly before setting again. The colour range is enormous but the classical colours are scarlet red (the historical standard for personal correspondence and legal documents), oxblood, deep green, black (once used for mourning correspondence), and gold or metallic tones for ceremonial use.
Modern sealing wax is available in two broad categories. Traditional wax (sometimes called “hard wax” or “period wax”) is the historical formulation, brittle when set, prone to cracking if the envelope is bent — appropriate for hand-delivered letters and framed keepsakes, less so for anything that will pass through the post. Flexible wax (also called “letter wax” or “postal wax”) uses a modified formula with added flexibility agents, staying elastic enough after cooling to survive a normal mail journey without shattering. For an envelope that will actually be posted, flexible wax is the only sensible choice. A flexible sealing wax for postage in scarlet is the working wax of anyone who actually sends sealed letters.
The Wax Seal Matrix
The matrix (also called the seal, the stamp, or the intaglio) is the metal die that impresses the design into the molten wax. Historically, matrices were engraved in brass, bronze, or steel, and mounted on a wooden or bone handle. Antique seals — Georgian and Victorian intaglios in carved carnelian or agate, mounted in gold or silver fob-seals — are collectable objects in their own right and often surprisingly affordable at auction.
For a modern user, a machine-cut brass matrix on a wooden handle is the standard tool, made by a number of good specialists to any design (a family monogram, a botanical motif, a heraldic device, a single letter). A custom brass wax seal stamp engraved with a personal monogram is a small investment (typically $40-$120) that pays back over years of correspondence and is a lovely gift.
Two matrix sizes to know: standard (about 25mm across the face) is the working size for personal letters, sealing the flap centrally without dominating the envelope. Large (30-40mm) is for wedding invitations, ceremonial letters, and larger envelopes where the seal is a design feature. Small (15-20mm) is for small correspondence cards and gift tags.
Making a Proper Seal
Three methods, in ascending order of quality.
Method one — the wick stick. Traditional stick wax is available with a small wick embedded down the centre, which is lit at the end and dripped onto the envelope as it burns. Simple, but the burnt wick often deposits soot into the wax and the flow is uneven. This method is fine for casual use and dramatic in the moment, but the resulting seal is often less clean than the alternatives.
Method two — the wick-less stick and a candle. A stick of wax without a wick is held over a candle flame; the wax melts and drips onto the envelope from the softened tip. Cleaner than the burning-wick method, but still uneven and requires practice to control the drip.
Method three — beads and a spoon. Wax beads (small pellets, sold by the bag in every colour) are portioned into a small brass or steel spoon designed for the purpose, and the spoon is held over a candle or tea light until the beads melt to a smooth liquid. The molten wax is then poured in one confident motion onto the centre of the envelope flap, creating a pool about 30mm across. This is the professional method: consistent, clean, and produces a perfect glassy pool every time. A wax seal starter kit with beads and melting spoon is the fastest way to reliable seals.
Once the pool is in place, wait five to eight seconds — the wax should look glossy but no longer perfectly liquid, and just begin to set at the edges — then press the matrix straight down into the wax with firm even pressure, hold for ten seconds without any twist or wiggle, and lift straight up. Rushing the press produces a smeared impression; twisting the matrix during the press ruins the seal entirely. If the seal fails, wait for the wax to cool completely, scrape it off with a knife, and try again — the wax is not wasted from the practice.
Sealing for the Post
An envelope sealed with flexible wax and posted through a normal mail system will nearly always arrive with the seal intact, provided a few precautions are taken. Post the envelope in a rigid card mailer or between two sheets of stiff card if the seal is on a light envelope that might bend. Ask the post office to hand-cancel the envelope (many will, if requested; automated cancellation machines can crack a seal). Consider posting from the counter rather than a mailbox to reduce the number of jostles in transit. Even without any of these precautions, most seals will still travel — the flexible wax is genuinely tough — but for wedding invitations and other pieces where perfection matters, the extra care is worth it.
Historical and Ceremonial Uses
Beyond personal correspondence, wax seals appear in a range of contemporary and traditional uses. Wedding invitations sealed with a monogram or motif from the couple. Ceremonial and legal documents (in some jurisdictions, notary work still uses embossed rather than wax seals, but wax survives for symbolic use in wills, indentures, and church documents). Fraternal and academic use — many old universities and orders still seal their formal documents with wax. Gift tags sealed with wax and tied to a wrapped present. Even the labels on small-batch bottles of spirits, jam, and honey occasionally carry a wax seal as a mark of craftsmanship.
Questions from the Writing Desk
Will a wax seal survive being posted?
Modern flexible sealing wax survives normal postage the great majority of the time. Traditional (hard) sealing wax is much more likely to crack or shatter in transit. For anything mailed, use a flexible letter-wax formulation, ask the post office to hand-cancel the envelope (to avoid the mechanical franking machines that can crack seals), and consider posting in a rigid card mailer if the seal is on a light envelope. With these precautions, wedding invitations and personal letters sealed with wax arrive intact reliably.
What is the best sealing wax for beginners?
A small bag of flexible sealing wax beads (available in every colour from a number of specialist suppliers), a brass melting spoon designed for the purpose, and a simple wooden-handled brass seal stamp — the total outlay is under $50 and produces reliable clean seals with very little practice. Avoid the wick-in-the-stick traditional wax for early attempts; the flow is unpredictable and the results are often disappointing. Start with beads and a spoon.
Can I make my own wax seal stamp with a custom design?
Yes. A number of specialist workshops will engrave a brass matrix to any design supplied as a vector file — monograms, family crests, botanical illustrations, single letters, small custom illustrations. Turnaround is typically two to four weeks, and prices run from about $40 for a simple monogram to $150 or more for a fully custom heraldic design. Once made, the matrix will last a lifetime with normal use. A single custom stamp is a lovely wedding gift or personal indulgence.
What colour of sealing wax should I use?
Scarlet red is the historical default for personal correspondence and remains the classical choice. Oxblood (a darker, more subtle red) reads as slightly more refined. Deep green, gold, cream, and metallic bronze are all traditional alternatives. Black wax was historically used exclusively for mourning correspondence — a piece of etiquette worth respecting; black wax on a wedding invitation reads oddly to anyone who knows the tradition. For a wedding, match the wax colour to the invitation palette or use a metallic (gold, rose gold, silver) for extra ceremony.
Do you press the seal into hot or cool wax?
Neither. The correct moment is when the wax is still glossy but has just begun to lose its perfect liquid sheen — usually five to eight seconds after pouring, depending on the wax and the ambient temperature. Pressed too soon (fully liquid), the wax squeezes out from under the matrix and produces a smeared impression. Pressed too late (fully set), the wax will not take the impression at all. A little practice teaches the eye to see the right moment. Press straight down with even pressure, hold for ten seconds without twisting, and lift straight up. The seal is done.
See also: The Art of Letter Writing · Fine Stationery · Calligraphy.
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