将钢材或钢件在空气-水蒸气或化学药物中加热到适当温度使其表面形成一层蓝色或黑色氧化膜的工艺。也称发黑。黑色金属表面经“发蓝bluing”处理后所形成的氧化膜，其外层主要是四氧化三铁，内层为氧化亚铁。
而金属零件都是高度抛光和发蓝到深，丰富的黑色。
And the metal parts are all highly polished and blued to a deep, rich black color.
18岁的她，身高1米65，金发垂顺及肩，大眼睛闪闪发蓝，皮肤苍白明净。
At eighteen she was 5 '5 "tall and had straight shoulder length blond hair, big blue eyes, and pale clear skin."
因为在北方冬季太阳低，使人觉得似乎阳光有点发蓝，而在炎热的夏季令人觉得阳光似乎是黄色的。
Because in the north the sum is low during winter, the sunlight appears quite blue. Because the sun is higher during summer, the hot summer sunlight appears yellow.
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