Seal (device)

Seal (device)

A seal can mean a wax seal bearing an impressed figure, or an embossed figure in paper, with the purpose of authenticating a document, but the term can also mean any device for making such impressions or embossments, essentially being a mould that has the mirror image of the figure in counter-relief, such as mounted on rings known as signet rings. This article is concerned with devices and methods for making such imprints.

If the imprint is made as a relief resulting from the greater pressure on the paper where the high parts of the seal touch, the seal is known as a "dry seal"; in all other cases a liquid or liquified medium (such as ink or wax) is used, usually in another color than the paper's.

Sigillography is the term used for the study of seals.


The use of seals, in wax, in lacquer or embossed on paper, to authenticate documents, is a practice as old as writing itself. Seals of this nature were applied directly to the face of the document or attached to the document by cords in the owner's, or to a narrow strip of the document sliced and folded down as a tail but not detached from the document. This helped maintain authenticity by not allowing the reuse of the seal. If a forger tried to remove the seal in the first case, it would break. In the other cases, although the forger could remove the seal intact by ripping the cords from the paper, he would still have to separate the cords to attach it to another document, which would destroy the seal as well because the cords had knots tied in them inside the wax seal. Most governments still attach seals to letters patent. While many instruments required seals for validity (i.e. the deed or covenant) it is rather uncommon for private citizens to use seals anymore.

Seals were also applied to letters and parcels to indicate whether or not the item had been opened since the seal was applied. Seals were used both to seal the item to prevent tampering, as well as to provide proof that the item was actually from the sender and is not a forgery. To seal a letter, for example, a letter writer would compose the letter, fold it over, pour wax over the joint formed by the top of the page of paper, and then impress a ring, metal stamp, or other device. Governments would often send letters to citizens under the governmental seal for their eyes only. These were called letters secret. Seals are no longer commonly used in this way, except for ceremonial purposes.

The most common uses of the seal today are:
# to certify that a person has given an oath or acknowledgement, see notary public
# to certify the correctness of a copy of a record maintained by a court or other government agency.

Ancient Near East

Seals were used in the earliest civilizations and are of considerable interest in archaeology. In ancient Mesopotamia seals were engraved on cylinders, which could be rolled to create an impression on clay e.g.,as a label on a consignment of trade goods. From Ancient Egypt seals in the form of signet-rings of kings have been found.

Recently, seals have come to light in South Arabia datable to the Himyarite age. One example shows a name written in Aramaic (Yitsḥaq bar Ḥanina) and engraved in reverse so as to be visible in the impression.

In the Indus Valley Civilization, rectangular seals were used to label trade goods and also had other purposes.Fact|date=October 2007

Ancient Aegean

From the beginning of the 3rd millennium BC until the Dark Ages, seals of various kinds were in production in the Aegean islands and mainland Greece. In the Early Minoan Age these were formed of soft stone and ivory and show particular characteristic forms. By the Middle Minoan Age a new set for seal forms, motifs and materials appear. Hard stone requires new rotary carving techniques. The Late Bronze Age is the time par excellence of the lense-shaped seal and the seal ring.

East Asia

Known as 印章 (Pinyin: yin4zhang1) in China, "dojang" or "ingam" in Korea and "inkan" or "hanko" in Japan, ink seals have been used in East Asia as a form of written identification since the invention of writing. Even in modern times, seals are still commonly used instead of handwritten signatures to authenticate official documents or financial transactions. Both individuals and organizations have official seals, and they often have multiple seals in different sizes and styles for different situations. East Asian seals usually bear the name of the person or organization represented, but they can also bear a poem or a personal motto. Sometimes both types of seals, or one large seal that bears a name and a motto, are used to authenticate official documents. Seals are so important in East Asia that foreigners who frequently conduct business there also commission the engraving of a personal seal.

East Asian seals are carved from a variety of hard materials, including wood, soapstone, seaglass and jade. East Asian seals are traditionally used with a red oil-based paste consisting of finely ground cinnabar, which contrasts with the black ink traditionally used for the ink brush. Red chemical inks are more commonly used in modern times for sealing documents. Seal engraving is considered a form of calligraphy in East Asia. Like ink brush calligraphy, there are several styles of engraving. Some engraving styles emulate calligraphy styles, but many styles are so highly stylized that the characters represented on the seal are difficult for untrained readers to identify. Seal engravers are considered artists, and in the past, several famous calligraphers also became famous as engravers. Some seals, carved by famous engravers, or owned by famous artists or political leaders, have become valuable as works of art and history.

Because seals are commissioned by individuals and carved by artists, every seal is unique, and engravers often personalize the seals they create. The material of seal and the style of the engraving are typically matched to the personality of the owner. Seals can be traditional or modern, conservative or expressive. Seals are sometimes carved with a figure on the owner's zodiac animal on the top of the seal. Seals are also sometimes carved with images or calligraphy on the sides.

Although it is a utilitarian instrument of daily business in East Asia, Westerners and other non-Asians seldom see Asian seals except on Asian paintings and works of calligraphy. All traditional paintings in China, Japan, Korea, Vietnam, and the rest of East Asia are watercolor paintings on silk, paper, or some other surface that the red ink from seals can adhere to. East Asian paintings often bear multiple seals, including one or two seals from the artist, and the seals from the owners of the painting.

East Asian seals are the predecessors to block printing.

ignet rings

Signet rings, generally bearing a coat of arms, are made by
intaglio engraving, either in metal or gems (generally semiprecious). Agate is a frequent material, especially carnelian or banded agate like sardonyx; the banding make the impression contrast with the ground.

Metal signet rings can also be cast, which is cheaper but yields a weaker material.

The wearing of signet rings (from Latin "signum" meaning sign) is a longstanding tradition among nobles in European and some other cultures. In contemporary usage, the signet ring is typically worn on the little finger of either the right or left hand (depending on the country), although some countries have different customs (French and German noblemen, and some Spanish nobles wear it on the ring finger of their left hand; Swiss wear it on the ring finger of their right hand). In the United Kingdom, signet rings are typically worn on the little finger of the left hand of the bearer and tend to be cast of gold. The ring should be worn with the seal facing outwards to enable wax impressions without removing the ring.

Because it is used to attest the authority of its bearer, the ring has also been seen as a symbol of his power, which is one explanation for its inclusion in the regalia of certain monarchies. After the death of a Pope, the smashing of his signet ring is a prescribed act clearing the way for the sedevacancy and subsequent election of a new Pope.

Signet rings are also used as souvenir or membership attribute, e.g. class ring (typically bear the coat of arms or crest of the school), as an alternative to one with a stone.

The wearing of a signet ring is declining as the European aristocracy diminishes, however noble families have upheld long standing traditions of wearing signet rings for centuries. Sometimes the initials of the individual are engraved into the ring if the person is not of noble descent and does not have the right to bear arms.

Ecclesiastical seals

The use of a seal by men of wealth and position was common before the Christian era, so naturally high functionaries of the Church would adopt the habit as soon as they became socially and politically important. An incidental allusion in one of St. Augustine's letters (217 to Victorinus) lets us know that he used a seal. The practice spread and it seems to be taken for granted by king Clovis at the very beginning of the Merovingian period (Monum. German. Histor.: Leg., II, 2).

Later ecclesiastical synods require that letters under the bishop's seal should be given to priests when for some reason they lawfully quit their own proper diocese. So it was enacted at Chalon-sur-Saône in 813. Pope Nicholas I in the same century complains that the bishops of Dôle and Reims had "contra morem" sent their letters to him unsealed (Jaffé, "Regesta", nn. 2789, 2806, 2823). The custom of bishops possessing seals may from this date be assumed to have been pretty general. At first they were only used for securing the document from impertinent curiosity and the seal was commonly attached to the ties with which it was fastened. When the letter was opened by the addressee, the seal was necessarily broken. Later the seal served as an authentication and was attached to the face of the document. The deed was thus only held to be valid so long as the seal remained intact. It soon came to follow from this point of view that not only real persons like kings and bishops, but also every kind of body corporate, cathedral chapters, municipalities, monasteries etc., also required a common seal to validate the acts which were executed in their name.

During the early Middle Ages seals of lead, or more properly "bullae" (from the Latin for lead), were in common use both in East and West, but except in the case of the papal chancery, these leaden authentications soon went out of favour in western Christendom and it became the universal practice to take the impressions in wax. In England hardly any waxen seals have survived of earlier date than the Norman Conquest. In the British Museum collection the earliest bishop's seals preserved are those of William of St. Carileph, Bishop of Durham (1081-96) and of St. Anselm, Archbishop of Canterbury (1093-1109). The importance of the seal as a means of authentication necessitated that when authority passed into new hands the old seal should be destroyed and a new one made. When the pope dies it is the first duty of the Cardinal Camerlengo to obtain possession of the Fisherman's Ring, the papal signet, and to see that it is broken up. A similar practice prevailed in the Middle Ages and it is often alluded to by historians, as it seems to have been a matter of some ceremony. Thus we are concisely told: "There died in this year Robert de Insula, Bishop of Durham. After his burial, his seal was publicly broken up in the presence of all by Master Robert Avenel." (Histor. Dunel. Scrip. Tres., p. 63). Matthew Paris gives a similar description of the breaking of the seal of William of Trumpington, Abbot of St Albans, in 1235.

A related practice is found among blacksmiths: their touchmark (a stamp used on the hot metal to show who made it) is destroyed upon their death.

Figurative uses

*Seal of confession
*Record sealing


The expression "Seal of Approval" refers to a formal approval, regardless whether it involves a seal or other external marking, by an authoritative person or institute.

It is also part of the formal name of certain quality marks, such as:
* Good Housekeeping Seal of Approval of the Good Housekeeping Institute
* Good Netkeeping Seal of Approval
* Nintendo Seal of Approval

ee also

* Bulla (seal), a lump of clay molded around a cord and stamped with a seal
* Cylinder seal
* Dartmouth College Seal, used by Dartmouth College of Hanover, New Hampshire, USA.
* Great Seal
**Great Seal of the Realm, a British institution for authorising the monarch's official documents a personal signature
**Great Seal of Scotland allows the monarch to authorise documents without signing
**Great Seal of France, used to authenticate constitutional documents of the French Republic
**Imperial Seal of Japan, called 菊の御紋 in Japanese, meaning "Noble Symbol of Chrysanthemum"
**Great Seal of the United States used since 1782 to authenticate some documents issued by the United States government
**Great Seal of Northern Ireland
**Great Seal of Canada
**Privy Seal, of England can be traced back to the reign of King John
** Lord Privy Seal or "Lord Keeper of the Privy Seal" is one of the traditional sinecure offices of state in the United Kingdom
* Knights Templar Seal used to validate documents approved by the order
* Manu propria
* Rubber stamp
* Seal (Chinese)
* Seal of Solomon, a legendary magical signet ring said to have belonged to King Solomon
* Seals of the U.S. states
* Sigillography
* Signature
* State seal

ources and external links

* [ UK National Archives on seals]
* [ UK National Archives advice on preservation]
*Catholic []
* [ Not All Online Authority Seals are Credible] - Harvard's Ben Edelman says "Suppose users have seen a seal on dozens of sites that turn out to be legitimate. Dubious sites can present that same seal to encourage more users to buy, register, or download."
* Boardman, John. "Greek Gems and Finger Rings". New York 1972
* Yule, Paul. "Early Cretan Seals: A Study of Chronology". Marburger Studien zur Vor und Frühgeschichte 4 (Mainz 1981), ISBN 3-8053-0490-0

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