Two samples (stars) “Crackling Flower” and “Green Strobe” from the firewors cake “Time Show” GP512 were studied by XRD (X-ray phase analysis) and EMA (elemental microanalysis) on SEM (scanning electron microscope). The stars were cut into three parts, and the central part was further polished. Separately, the compositions of each layer were extracted and ground into powder. Analyzes were conducted without internal standards, therefore, the composition of the mixtures is approximate and needs to be adjusted.
Approximate composition of green strobe: Ba(NO3)2 - 70...75%, AlMg - 15...20%, organochlorine - 5...7%, Bi2O3 - no more than 3%, S - no more than 2%, binder - the rest. The color of star in the sky is dirty green, on the ground - acceptable.
The cracking flower star has three areas (layers) of different compositions. The first layer is the usual BP, the second layer is the common Chinese prime with the addition of perchlorate K and magnalium and titanium, the third layer is the core - copper oxide - bismuth oxide - magnalium system. Prime: KNO3 - 60...65%, KClO4 - 5...10%, S - 7...12%, C - 7...12%, AlMg - 10...15%, Ti - 3. ..5%. The titanium in the prime with size of 0.2 ... 0.5 mm. Approximate composition of the crackling core: CuO - 55...60%, AlMg - 35...40%, Bi2O3 - 5...10%. All formulations contain unidentified binder. The photo of the crackling star under the SEM is shown below.