fireworks, Fourth of July, United States, Independence Day Peacock Feather/Dragonfly: Pyrotechnicians agree that the blue-violet shades of this peacock feather are the most challenging to formulate.
孔雀羽毛/蜻蜓。烟花制造者认为制造这种孔雀羽毛图案的蓝紫色效果最富有挑战性。
fireworks, Fourth of July, United States, Independence Day Peacock Feather/Dragonfly: Pyrotechnicians agree that the blue-violet shades of this peacock feather are the most challenging to formulate.
孔雀羽毛/蜻蜓。烟花制造者认为制造这种孔雀羽毛图案的蓝紫色效果最富有挑战性。
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