Petrol Colors
Oxford points toward blue-green or blue-gray; RAL uses teal blue. The useful answer is a neighborhood.
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Dictionary entry: petrol blue occupies deep blue-green and blue-gray territory. An official RAL color carries the German name Petroleumblau and the English label Teal blue, confirming that the word travels across familiar categories.
Palette translation: Midnight Blue and Dark Slate Gray establish the two darker directions. Teal and Dark Cyan occupy the recognizable center; Steel Blue and Cadet Blue show how the family cools and softens. Petrol works because the neighborhood is stable even when its exact address changes.
