nigrescence 中文意思是什麼
nigrescence
解釋
n. 名詞 變黑；（顏色；皮膚；眼睛等的）發黑。-
Carbon channel is usually finished with electro - galvanization. hot dipped galvanzined finish or epoxy coating or nigrescence is also available on special order
碳鋼型鋼的表面處理普通為電鍍，如需熱浸鍍鋅、噴塑、發黑等要在訂貨時說明。 -
Reshi chemicals is a specialist in manufacturing and distributing metal surface treatment reagent : phosphorus treatment reagent, water treatment reagents, electro - plating additive reagents, normal temperature nigrescence reagent, pre - treatment reagents, etc
是一家專業從事金屬表面處理藥劑：磷化處理藥劑、水處理劑、電鍍添加劑、鋼鐵常溫發黑劑以及前處理產品的生產商和代理商。
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