Pasting a prime composition on the end of an industrial fuse

In Japan industrial fuse(Bickford) has recently been used in place of the hand made fuse the manufacture of the latter is quite labour intensive. In order to catch fire from some other heat source or to transfer the fire to other pieces the two ends of a cut fuse are pasted with a slurry of a prime composition. Sometimes a match composition which contains chlorate is pasted on one end so that it is ignited when it is rubbed with a red phosphorus striker. In general the slurry is a mixture of black powder and 10% nitrocellulose solution in acetone. In place of the nitrocellulose, celluloid solution can also be used. The ratio of the black 

The slurry must be stirred often to prevent the component substances form settling out during the pasting. The solvent should clearly be a substance which is easily vapourized acetone is good, but amyl acetate is not so good. 

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