Under the principle of conservation

When we design a firework we must clearly foresee the conditions of manufacture, transportation, use etc. and take the necessary steps so that an accident does not occur. 

Compositions. Red phosphorus, sulphur, realgar, antimony trisulphide or other sulphides should possibly be rejected from the compositions. It is the same to chlorates also. These materials increase the sensitivity of almost all compositions. However in practice, the requirement is not always satisfied sufficiently, and each one must be considered individually. The sensitivities in Table 28, 29 and 30 (Chapter 27) may be used for planning 

Other materials. Shells which explode in the sky are so planned that they turn into light fragments with no residual fire after the explosion. 

The binders generally contains organic solvents which is not good for health, and are not always recommended. Paints, lacquers, varnishes or binders must be used so that they do not damage the function of firework pieces. 

In particular they are not good for fuses, because their vapour permeates the fuses as time passes and damages them. The pieces must be assembled after the vapour is thoroughly dried out. 

---

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... 

---