He uses violet - colored ink in his fountain pen because it lasts longer.

他自个儿擦皮鞋,熨裤子,洗衣服.

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Ultra - violet visible spectrum, but why does an ultra - violet lamp emit violet colored light?

紫外光系?湛杉?馄滓酝? 但系点解我地可以见到紫外光灯发出紫色?

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KCr ( SO 4 ) 2.12 H 2 O; a violet - colored salt used in hide tanning and as a mordant in dyeing.

KCr ( SO ) .HO; 一种紫罗兰色的盐,用于制革和作媒染剂.

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