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Resolver épocas para este enigmaFotoThe first "friction match" was invented by English chemist John Walker in 1827. Early work had been done by Robert Boyle in the 1680s with phosphorus and sulfur, but his efforts had not produced useful results. Walker discovered a mixture of antimony sulfide, potassium chlorate, gum, and starch could be ignited by striking against any rough surface. Share this Jigsaw Puzzle | Enigmas recentesThu Water Buffalo WadingWed Winter Mirror Lake HutTue Old Red Semi TruckSegunda-feira Zebra in TulipsSol Cat Cobble PuddleSentado Canyon Sky LightFri Flowerpot Kombi Enigmas mais precedentes | |
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