Sentence:  Slanders, sir: for the satirical rogue says here that old men have grey beards, that their faces are wrinkled, their eyes purging thick <WSD>amber</WSD> and plum-tree gum and that they have a plentiful lack of wit. 
Meaning of the word marked with <WSD> tags:  A hard, generally yellow to brown translucent fossil resin, used for jewellery. One variety, blue amber, appears blue rather than yellow under direct sunlight. (from 15th c.)