Slow match, also called match cord, is the slow-burning cord or twine fuse used by early gunpowder musketeers, artillerymen, and soldiers to ignite matchlock , , shells, and . Slow matches were most suitable for use around black-powder weapons because a slow match could be roughly handled without going out, and only presented a small glowing tip instead of a large flame that risked igniting nearby gunpowder. Slow match of various types was one of the first kinds of artillery fuze.
Slow matches were also used in the drilling and blasting of rock to ignite charges of gunpowder.
Many formulas for match cord exist, providing varying burn rates. The predominant chemical used was potassium nitrate, although sodium nitrate, and lead(II) acetate also appear to have been used. Potassium nitrate had an advantage over sodium nitrate, being less likely to absorb atmospheric moisture.
Match cord was often used from the 15th century until about 1630, when the flintlock started its rise to prominence. (The arrival of the snaplock after 1540 had only limited impact on match cord use, snaplocks generally being considered a peasant's weapon.) Match cord remained in use with limited numbers of matchlocks in Europe until approximately 1730, and in Japan until the early 1900s. Even once it became obsolete for small arms use, some artillery users (notably the Royal Navy) continued to deploy it as a backup until the end of the flintlock era.
Historic England published a well illustrated account of the investigation of conservation work on a slow match pouch found in the intertidal zone at Medmerry, West Sussex, now in the collection of the National Museum of the Royal Navy.
For faster burning and modern-day applications such as for igniting fireworks, either tubed black match (sometimes termed quick match) or punk are generally used instead of slow match.
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