yellowing
黃化; 黃化現象; 發黃
Yel·low v. t. [imp. & p. p. Yellowed p. pr. & vb. n. Yellowing.] To make yellow; to cause to have a yellow tinge or color; to dye yellow.
Yel·low·ing, n. The act or process of making yellow.
Softened . . . by the yellowing which time has given. --G. Eliot.
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