Re: Framing an oil painting under glass
Framing an oil under glazing is actually the preferred preservation framing method.
It provides several benefits:
~ It protects the painting from physical trauma from the front and also helps protect the artwork from airborne pollutants.
~ If UV coated glazing is used, it also helps protect the painting from the most harmful UV rays.
~ It provides a micro environment allowing temperature and humidity changes to be more gradual.
You don't say whether the painting is on a stretched canvas or a panel. If it is a stretched canvas, you should also put a board backing on the verso side of the frame. This can be rag board, AF Foam Core or polyflute board. This protects the canvas from physical trauma during transport, seals the back to prevent insects and dirt from accumulating and also helps seal the microenvironment.
If it is a panel, then either use a board as outlined above or apply a paper or Tyvek dustcover.
The old adage that paintings need to "breathe" has been dismissed by conservationists.
A few other things that should be mentioned.
~ If the painting were somewhat freshly painted, and this one is not, then during the continued drying process some out gassing does occur and the frame package would need to be opened up down the line to clean any film on the glazing.
~ No artwork should be hung where the sun hits the artwork, but this is especially true of sealed frame packages. They can rapidly rise in heat and a sealed frame package could create a greenhouse effect making the interior heated. This can cause chemical change to accelerate.
~ I have been using the term glazing instead of glass or plexiglass because the preferred glazing would be an optically coated acrylic plexiglass. Acrylic glazing is not nearly as breakable and if you use glass there is a danger of breakage which could cause physical damage to the painting.
One last point... your "pH" balanced board indicates that it is a buffered board. This creates a temporary "acid free" status which is not all you should be concerned about. Buffered boards eventually become acidic. Also, another chemical mix in the board would be lignins which are wood by-prodcuts which also are not something you want near any artwork. The rule of thumb is to keep all such materials at least 1" away from the artwork to prevent migration of harmful chemicals.
Last edited by DaveMak : 09-29-2011 at 10:06 AM.