Under the principle of separation and isolation

The amount of composition used for each firework piece should be as small as possible. Compositions should not be exposed on the outside of the piece which is finished so that it could catch fire. 

Cover all pieces against fire. For example, toy firework pieces should be packed in bags or cases in small amounts, the quick match must be covered 

An igniter must be perfectly separated from the striker,i.e. the striker must be packed perfectly, e.g., with a piece of paraffin paper or placed in an isolated space so that the red phosphorus composition on the striker is perfectly separated from the prime composition. Actually about twenty years ago an accident occurred during the transportation of a packed case of toy fireworks called Bengal Match by a porter in a Yokohama warehouse. It may be that it was caused by an imperfect isolation of the striker. 

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Under the principle of conservation 2. 2. Under the principle of maintenance 2. 3 Under the prinqiple of clearness 2. . Under the principle of simplicity 2. 5 Under the principle of separation and isolation... 

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