# Slow match
A slow match is a length of cord, chemically treated so that it smolders slowly without an open flame, used to carry fire to the priming powder of a matchlock firearm or, in some cases, a cannon. It was the standard means of igniting gunpowder weapons for roughly two centuries and gave its name to the matchlock mechanism that held it.[1](https://oro.open.ac.uk/57720/1/339857.pdf) • [2](https://data.fitzmuseum.cam.ac.uk/id/terminology/term-52729)
| Key fact | Detail |
|---|---|
| Construction | Cord of hemp, flax, or cotton soaked in a strong potassium nitrate (saltpeter) solution and dried[1](https://oro.open.ac.uk/57720/1/339857.pdf) • [3](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/) |
| Burning rate | About an inch per minute according to one account; roughly one foot per hour according to another, smoldering without an open flame[1](https://oro.open.ac.uk/57720/1/339857.pdf) • [3](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/) |
| Function | Glowing end lowered into a flashpan of priming powder; the flash passed through a vent to ignite the main charge[1](https://oro.open.ac.uk/57720/1/339857.pdf) |
| Era | Used from the early gunpowder era; superseded in Europe by the 17th century, but used across Asia into the 19th century[4](https://data.fitzmuseum.cam.ac.uk/id/object/158337) |
| Carried quantity | Japanese gunners commonly carried three meters of match cord or more wrapped around the wrist or arm[5](https://www.mlit.go.jp/tagengo-db/en/R4-00157%2Chtml) |
| Main weaknesses | Rain, wind, and humidity could extinguish it; the glowing end was visible in darkness and could ignite loose powder[3](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/) |
| Legal status | The matchlock ignition system is named in the United States federal definition of an "antique firearm" for weapons manufactured in or before 1898[6](https://apnews.com/article/4aba06f4d5254dd3f2c03b0193794323) |
## How it was made and how it burned
The treatment that made an ordinary cord into a slow match was saltpeter. A piece of cord was soaked in a strong solution of potassium nitrate and then dried; once lit, the treated cord smoldered with a glowing end instead of bursting into flame.[1](https://oro.open.ac.uk/57720/1/339857.pdf) The fibers varied by region: European match cord was made from hemp, flax, or cotton,[3](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/) while Japanese match cords (hinawa) were made from the fibers of plants including cotton, bamboo, and cypress, and were often treated with saltpeter to increase flammability.[5](https://www.mlit.go.jp/tagengo-db/en/R4-00157%2Chtml)
An 18th-century recipe for artillery match describes hempen tow spun slackly into cord, covered with tow so the twills did not show, and boiled in the lees of old wine; once lit at one end it was said to burn on gradually and regularly without going out until consumed.[7](https://jimclifford.ca/britannica-articles-1/a/EB.1/144133903/225.html)
The sources give different burning rates. An [Open University](https://www.edgepedia.org/open-university) history of ignition systems states that the match smoldered at about an inch per minute,[1](https://oro.open.ac.uk/57720/1/339857.pdf) while a LegalClarity account of the matchlock puts the rate at roughly one foot per hour.[3](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/) Both descriptions agree on the essential point that the burn was slow, steady, and flameless. Once lit, a Japanese match cord typically smoldered for several hours, but gunners still carried flint and tinder, or a container of mugwort embers, to relight it if it went out.[5](https://www.mlit.go.jp/tagengo-db/en/R4-00157%2Chtml)
## Use in the matchlock
Before mechanical ignition, a firer had to place a glowing twig or hot wire directly into the touch hole at the rear of the barrel. This required being near a fire, left ignition at the mercy of wind and rain, and made aiming difficult. The slow match was developed to overcome this lack of mobility.[1](https://oro.open.ac.uk/57720/1/339857.pdf)
The matchlock, named for the slow match, was the first mechanical ignition device on firearms. The match was clasped in a curved arm called the serpentine, and pulling the trigger lowered the glowing end into a flashpan holding loose priming powder; the flash passed through a small vent to ignite the main propellant charge.[1](https://oro.open.ac.uk/57720/1/339857.pdf) • [8](https://americansocietyofarmscollectors.org/wp-content/uploads/2025/11/FullCombinedFiles_Edit1Nov8th_Compressed.pdf) This let a shooter fire with both hands on the weapon and both eyes on the target.[3](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/) • [9](https://www.metmuseum.org/de/perspectives/decorous-and-deadly)
Later refinements included a spring-loaded cover for the flash pan, opened automatically by the trigger, which protected the priming powder from being scattered or dampened, and a safety catch or "dog" that held the serpentine away from the pan until the trigger was deliberately pulled.[10](https://www.historyrise.com/article/the-development-of-the-matchlock-firearm-in-15th-century-asia-and-europe/)
## Limitations in the field
**Weather was the match's chief enemy.** Rain or strong wind could extinguish the cord, and humidity degraded both the match and the priming powder. Experienced soldiers often kept both ends of the cord lit as a backup, and some carried two or three lit matches at once.[3](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/) • [10](https://www.historyrise.com/article/the-development-of-the-matchlock-firearm-in-15th-century-asia-and-europe/)
The glowing cord created two further problems. In darkness it was visible at a considerable distance, which made night ambushes and sentry duty dangerous for matchlock-armed troops, and the flash of the priming powder likewise betrayed the shooter's position. Carrying an open source of fire near loose gunpowder also created a constant risk of accidental ignition; glowing embers could set off powder in a gunner's bandolier or on the ground.[3](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/) • [10](https://www.historyrise.com/article/the-development-of-the-matchlock-firearm-in-15th-century-asia-and-europe/) Even under ideal conditions, estimates suggest only about 70 to 75 percent of matchlocks could be reliably fired in the chaos of combat.[3](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/)
Because the full loading sequence of measuring powder, ramming a ball, priming the pan, and managing the match cord was slow, matchlock infantry depended on volley fire and rotation systems to keep up a continuous rate of fire.[3](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/) [Matchlock](https://www.edgepedia.org/matchlock) muskets were also inaccurate, and were most effective when fired in massed volleys at close range.[11](https://collection.nam.ac.uk/detail.php?acc=2021-02-6-1-1)
## Equipment and supply
The match cord required its own accessories and logistics. Japanese gunners carried coils of match cord, pieces cut to a length of five sun (roughly 15 cm), cut cords readied on a board staked into the ground beside the gunner, and a cap to cover the lit end; the length carried into battle differed from army to army, but three meters or more wrapped around the wrist or arm was not uncommon.[5](https://www.mlit.go.jp/tagengo-db/en/R4-00157%2Chtml) The matchlock's demand for gunpowder, lead, and slow match created new industries and supply chains.[10](https://www.historyrise.com/article/the-development-of-the-matchlock-firearm-in-15th-century-asia-and-europe/) Leather pouches for carrying slow match were part of a gunner's kit; a leather slow match pouch recovered from the intertidal zone at Medmerry, West Sussex, has been conserved by [Historic England](https://www.edgepedia.org/historic-england) and compared with a similar artifact from the first HMS Invincible.[12](https://historicengland.org.uk/research/results/reports/60-2018)
Slow match was not confined to small arms. Museum terminology records chemically treated cords of this kind as used to fire the powder charge in matchlock firearms and some cannons,[2](https://data.fitzmuseum.cam.ac.uk/id/terminology/term-52729) and the 1771 [Encyclopædia Britannica](https://www.edgepedia.org/encyclop-dia-britannica) describes match as rope prepared to retain fire for artillery, mines, and fireworks.[7](https://jimclifford.ca/britannica-articles-1/a/EB.1/144133903/225.html) Historic weapons standards still group early artillery under the "flintlock/slow-match and lintstock era," with slow match and lintstock serving as the primary ignition systems for artillery.[13](https://dnr.maryland.gov/publiclands/Documents/HistoricWeaponsStandards.pdf)
## Decline and legacy
The matchlock mechanism was superseded in Europe by the 17th century, but matchlock firearms went on being used across Asia into the 19th century.[4](https://data.fitzmuseum.cam.ac.uk/id/object/158337) In India, where firearms had been used from the fifteenth century, the matchlock remained the preferred firearms mechanism until about 1830.[14](https://www.metmuseum.org/art/collection/search/30594) Matchlock guns were also favored for hunting large and dangerous predators such as lions, tigers, and boars, because the lock allowed both hands to grip the weapon.[9](https://www.metmuseum.org/de/perspectives/decorous-and-deadly)
The slow match survives in law as well as in collections. The United States Gun Control Act of 1968 defines an antique firearm as any weapon "with a matchlock, flintlock, percussion cap, or similar type of ignition system" manufactured in or before 1898, provided it has not been modified to fire modern ammunition, and most states have adopted that language.[6](https://apnews.com/article/4aba06f4d5254dd3f2c03b0193794323)
## References
1. [History of ignition systems, Open University Open Research Online (PDF)](https://oro.open.ac.uk/57720/1/339857.pdf)
2. [Matches, terminology definition, The Fitzwilliam Museum](https://data.fitzmuseum.cam.ac.uk/id/terminology/term-52729)
3. [Matchlock: How It Works, History, and Legal Status, LegalClarity](https://legalclarity.org/matchlock-how-it-works-history-and-legal-status/)
4. [Matchlock carbine O.31-1879, The Fitzwilliam Museum](https://data.fitzmuseum.cam.ac.uk/id/object/158337)
5. [Musket Match Cords, Japan Tourism Agency](https://www.mlit.go.jp/tagengo-db/en/R4-00157%2Chtml)
6. [Muskets like those from 1776 are mostly exempt from today's gun laws, AP News](https://apnews.com/article/4aba06f4d5254dd3f2c03b0193794323)
7. [MATCH, Encyclopædia Britannica, 1st ed. (1771)](https://jimclifford.ca/britannica-articles-1/a/EB.1/144133903/225.html)
8. [Luntlås, lontslot, American Society of Arms Collectors](https://americansocietyofarmscollectors.org/wp-content/uploads/2025/11/FullCombinedFiles_Edit1Nov8th_Compressed.pdf)
9. [Decorous and Deadly: Weapons of the Royal Hunt in India, The Metropolitan Museum of Art](https://www.metmuseum.org/de/perspectives/decorous-and-deadly)
10. [The Development of the Matchlock Firearm in 15th Century Asia and Europe, History Rise](https://www.historyrise.com/article/the-development-of-the-matchlock-firearm-in-15th-century-asia-and-europe/)
11. [Matchlock musket, 1645 (c), National Army Museum, London](https://collection.nam.ac.uk/detail.php?acc=2021-02-6-1-1)
12. [Conservation of a leather slow match pouch from Medmerry, West Sussex, Historic England](https://historicengland.org.uk/research/results/reports/60-2018)
13. [MPS Historic Weapons Standards, Maryland Department of Natural Resources](https://dnr.maryland.gov/publiclands/Documents/HistoricWeaponsStandards.pdf)
14. [Matchlock Gun, Indian, Rajasthan or Lahore, The Metropolitan Museum of Art](https://www.metmuseum.org/art/collection/search/30594)
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*Topic: Encyclopedia › Technology and the built world › Engineering and manufacturing › Explosives and ordnance › Explosive materials and chemistry*
*Initially written Sep 17, 2026 · Reviewed: Oct 15, 2026 · Edited: Oct 15, 2026 · Last review: Oct 15, 2026*
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