Joan: your problems may arise frome just the intense light or from
acidick reactions from papers, cardboards, or a number of things.
Take your project back to the pickel pot and remove ths oxides and
steam it off and it should be clean. If you continue to display this
item under the lights it will need to be continueing on the cleaning
and eventually a polishing prosses. the gentle wear of golds is what
keeps it prety, if you lay it in an oxydizing invernment it will