Sentence:  [G]old bears the fire, which ſilver doth not: but that is an excellency in nature, but it is nothing at all in uſe; for any dignity in uſe I know none, but that ſilvering will <WSD>ſully</WSD> and canker more than gilding; ... 
Meaning of the word marked with <WSD> tags:  To become soiled or tarnished.