Abstract
AbstractIn this research, 10 different pyrotechnic blue flame compositions were designed and compared. Chromaticity and luminosity parameters of the flame were measured using Ocean Optics JAZ‐ULM VIS‐Spectrometer equipped with a cosine corrector. Color saturation, luminous intensity, specific luminous intensity, oxygen balance, burn rate, actual and theoretical maximum density, color coordinates (X, Y) are presented and discussed.
Highlights
A blue pyrotechnic flame color with high saturation or color purity, is one of the biggest challenges in pyrotechnics
While several suitable pyrotechnic compositions can be formulated with a reasonable effort for red, green, and yellow at high color purity and high luminous intensity (Iv), there are much fewer examples for blue illuminants available
He discusses the evolution of colored flames throughout the years, even from the period before the introduction of potassium chlorate into pyrotechnic compositions
Summary
A blue pyrotechnic flame color with high saturation or color purity (pe), is one of the biggest challenges in pyrotechnics. One of the first spectroscopic investigations that reported an analysis of blue flames was carried out by Barrow & Caldin [2] They identified the emitting species as CuCl. Interestingly, mercury(I) chloride was used in these compositions as chlorine source. Koch compared all four copper(I)halides [14] He provided values of the 1931 CIE coordinates, as well as the dominant wavelength and color purity. The flame color of pyrotechnics containing metallic indium has been investigated These results do not indicate that indium is, even from a purely technical point of view, a viable alternative emitter [15]. The goal of the present study was to compare the pe and dominant wavelength of the best-known blue flame (star) compositions. An overview of pyrotechnic blue illuminants helps to select the best compounds for achieving the highest color saturation in a practical application
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