詞語：nigrescence
nigrescence的解釋
nigrescence[nai'ɡresəns]n. 變黑；（眼睛、頭髮、皮膚等的）黑色
nigrescence的意思
nigrescence 變黑;發黑;變黑,發黑;
nigrescence的參考例句
1.With regards to the surface treatment, our crafts include nigrescence, phosphorization, zinc plating, dacromet, nickel plating and copper plating. 表面處理有發黑、磷化、機械鍍鋅、達克羅、鍍鎳、鍍銅等工藝。
2.to be possible to spread in the silver personal ornament surface transparent cuticle cream, causes it to be more luminous, avoids the nigrescence. 可在銀飾表面塗一層透明指甲油，使其更加光亮，避免變黑。
3.This paper work out a better applied technique of steel normal-temperature quick nigrescence via discussing various factors' influence on the speed of nigrescence and the capability of plating. 本文討論了諸多因素對黑化速度及黑化膜性能的影響，確定較好的常溫快速化學發黑實用技術。