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The first successful friction match was invented in 1826 by John Walker, an English chemist and druggist from Stockton-on-Tees, County Durham. He developed a keen interest in trying to find a means of obtaining fire easily. Several chemical mixtures were already known which would ignite by a sudden explosion, but it had not been found possible to transmit the flame to a slow-burning substance like wood. While Walker was preparing a lighting mixture on one occasion, a match which had been dipped in it took fire by an accidental friction upon the hearth. He at once appreciated the practical value of the discovery, and started making friction matches. They consisted of wooden splints or sticks of cardboard coated with sulphur and tipped with a mixture of sulphide of antimony, chlorate of potash, and gum. The treatment with sulphur helped the splints to catch fire, and the odor was improved by the addition of camphor. The price of a box of 50 matches was one shilling. With each box was supplied a piece of sandpaper, folded double, through which the match had to be drawn to ignite it. Walker named the matches "Congreves" in honour of the inventor and rocket pioneer, Sir William Congreve. He did not divulge the exact composition of his matches. Between 1827 and 1829, Walker made about 168 sales of his matches. It was however dangerous and flaming balls sometimes fell to the floor burning carpets and dresses, leading to their ban in France and Germany. Walker either refused or neglected to patent his invention. In 1829, Scots inventor Sir Isaac Holden invented an improved version of Walker's match and demonstrated it to his class at Castle Academy in Reading, Berkshire. Holden did not patent his invention and claimed that one of his pupils wrote to his father Samuel Jones, a chemist in London who commercialised his process. A version of Holden's match was patented by Samuel Jones, and these were sold as lucifer matches. These early matches had a number of problems - an initial violent reaction, an unsteady flame and unpleasant odor and fumes. Lucifers could ignite explosively, sometimes throwing sparks a considerable distance. Lucifers were manufactured in the United States by Ezekial Byam. The term "lucifer" persisted as slang in the 20th century (for example in the First World War song Pack Up Your Troubles) and matches are still called lucifers in Dutch.