A while back you m-made a beastly noise and turned pale

• Like old manuscripts
• Like old newspapers
• Like a really old newspaper
• Showed age, as paper
• Noticeably old, as paper
• Discoloured with age
• Like discoloured paper

Wiktionary Word definitions in Wiktionary
Having a yellow color (or discoloration), especially when due to age. v (en-past of: yellow )

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Yellow \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.

WordNet Word definitions in WordNet
adj. changed to a yellowish color by age; "yellowed parchment" [syn: yellow ]