Degradation of Tinuvin 292 in varnish solutions

I use solutions of MS2A with addition of Tinuvin 292.  I usually
discard any left over varnish after three weeks as the Tinuvin
degrades quickly in solution.  However, in the interests of cost and
environmental friendliness, I wondered whether or not it would be
appropriate to add a second amount of 2% Tinuvin 292--assuming the
varnish had not been sitting around too long?

Rebecca Ellison
Oil Paintings Conservator
Amgueddfa Cymru - National Museum Wales
Cathays Park
Cardiff, CF10 3NP
+44 29 20573225


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                  Conservation DistList Instance 28:4
                   Distributed: Tuesday, July 1, 2014
                        Message Id: cdl-28-4-016
                                  ***