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MITRA Forum Question Details

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  • Is there a way to make copper resinate not to change colorsApproveRejectUn-ApproveSubscribeUn-Unsubscribe
    Question asked 2017-08-25 23:45:53 ... Most recent comment 2017-08-26 16:03:34
    Art Conservation Topics Oil Paint

    ​I am wondering if there is a way to protect copper resinate from changing colors and turning brown, would an UV varnish help?

Answers and Comments

  • EditDeleteModerator Answer

    ​First can you clarify what you mean exactly by "copper resinate"? There are various recipes reported in the literature and it would help us if you could state exactly which one you are using....

    Kristin deGhetaldi
    2017-08-26 15:27:18
  • ApproveRejectUn-ApproveUser Comment

    ​Hi Kristin. I am refering to Kremer´s Copper resinate. Contains colophony, copper. For green glazes.​ hope this helps


    2017-08-26 15:39:34
  • ApproveRejectUn-ApproveUser Comment

    copper resinate from kremer.jpg

    2017-08-26 15:40:54
  • EditDeleteModerator Answer

    ​Ah yes....we know this material well. The main thing to keep in mind is that verdigris is inherently unstable and could very easily discolor with or without a protective coating. That being said we do have examples of verdigris-containing paint in Old Master paintings that have survived fine and no one is quite sure why. In any case it is certainly best practice to applying a varnish coating that contains UV Light Stabilizers....Gamvar actually contains a UVLS already (Tinuvin 292) so this would be one type of varnish that you could use as a protective coating. 

    Kristin deGhetaldi
    2017-08-26 15:57:51
  • ApproveRejectUn-ApproveUser Comment

    ​Gamvar it is! thank you Kristin

    2017-08-26 16:03:34

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