Take a loadstone, powder it, and put it into a strong calcining pot. Cover it all over with a powder made of calx vive and colophonia, of each a like quantity, and also put some of this powder under it. When the pot is full, cover it and lute the closures with potters earth. Put them into a furnace and there let them boil. Then take them out and put them into another pot. Set them in the furnace again, and this do until they become a very white and dry calx. Take of this calx one part, of salt nitre very well purified four parts, and as much camphor, sulphur vivum, and the oil of turpentine and tartar. Grind all these to a subtle powder and searse them, and put them into a glass vessel. Then put as much spirit of wine well rectified as will cover them two fingers breadth. Then close them up and set the vessel in horse dung three months, and in that time they will all become a uniform paste. Evaporate all the humidity until the whole mass becomes a very dry stone. Then take it out and powder it, and keep it very dry.
If you take a little of this powder and spit upon it, or pour some water upon it, it will take fire presently, so that you may light a match or any such thing by it.
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