Lances coloured flames

A lance is a hrework that is about the size of a small pencil that functions in the manner of a flare (Figure 10.3). Thus, the theory of coloured flame production, as presented in Chapter 8, applies equally to the lance. 

Other coloured flames follow similar physico-chemical phenomena but operate in different regions of the spectrum. Consequently, the maker of the coloured lance has at his disposal copper salts for blue, strontium salts for red, sodium salts for yellow and barium salts for green, as shown in Table 10.2. 

LANCE Small, tubular firework designed to emit a coloured flame for about 90 seconds. Used for a visual effect in set-pieces. 

Wood meal is used for industrial explosives and also as an anticaking agent etc. It is q,uite cheap and does not disturb the colour of flames, and is used mainly for lance compositions, A standard test indicated less than ly moisture 6.5 8.5 cc/g apparent specific volume 7% of the meal passes 30 mesh less than lA% ashtThe Ind. Exp.S, J. Handbook of industrial explosives, p,215(1966)1. 

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