These contrasts are relative since yellow-green are cool next to red, orange or yellow, but would be considered warm next to blue-violet.
这些差异是相对的，黄绿色和红色、桔黄色或黄色相比是冷色但是和蓝紫色相比是暖色。
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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.