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W warm-up time 预热时间
This paper introduces two types of new photogrphic toning agents recently disclosed by 3M and Kodak, used for transforming warm tone of b /w film into cold tone.
本文介绍了美国3M公司及柯达公司最新推出的两类调色剂,可将黑白影像胶片的色调由暖调有效地调为冷调。
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