Part VII. On Composition Series for Practical Use


(1) The spectroscopic studies in the previous Parts are summarized so as to apply the principle of flame color creation for practical use.

(2) According to the results of (1), various samples of red, yellow, green and blue of several composition series are prepared. Their flame colors are examined by the naked eye and good colors are selected. According to these, effective color zones are written as enclosed areas in triangle graphs.

(3) As far as these studies are concerned the important results that seem to be common for each series are as follows:

a) The width of an effective composition zone in a graph is very narrow for low temperature flames and fairly wide for high temperature flames.

b) Ammonium perchlorate is the best oxidizer, for it can produce HCl in a flame and creates deep color.

c) Polyvinyl chloride is also the best additional ingredient that can create a deep color by producing HCl gas in the flame like ammonium perchlorate. d) It is necessary to completely protect compositions from moisture for high temperature flames to prevent the magnesium and other ingredients from reacting with each other. For practical applications deep and brilliant color flames are obtained only in accord with this consideration.

Ref: Selected Pyrotechnic Publication of Dr. Takeo Shimizu, Part 3,  pp 107-119

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