GLASS, MATS & FRAMING
Pastel paintings must be framed under glass. It is best to keep them out of direct sunlight.
Plexiglass- plexi is not preferred as it can have a static charge and can pull pastel away from the painting. They do make anti-static plexi but it is very expensive. It might be a consideration for a very large paintings (5' x 7') due to the weight of glass. Weight should not be an issue for smaller paintings say 36"x36" etc.
GLASS - there are a lot of glass choices. Your framer should have samples for you to look at. Tru-Vu is a manufacturer of art glass. Museum glass is the best and also the most expensive. It is anti-reflective and has 99% UV protection. It is not necessary to go this expensive unless you really want to. One framer told me "museum glass is meant for paintings in a museum". The average household does not need this. UV70 (made by Tru-Vu) is also a good glass. That being said, you want to protect your artwork. I have gone to using mostly museum type glass on most pieces with the exception of very small pieces.
When selecting glass for your pastel, you should consider the environment it will hang in and purchase the best grade your budget allows. A conservation grade glass is recommended over a non-conservation grade glass. Conservation grades of glass will provide more protection than non-conservation grades against harmful UV rays, although no glass is capable of completely preventing damage. Anti-reflection conservation grade glass is more expensive than regular conservation grade glass, but is recommended to reduce reflection and improve clarity.
Beware of some of the "reflection control" or "non-glare" glass. It has a frosty look and will dull, or lessen the clarity, of your paintings.
Different Glass Grades - Below is a description of the different grades of glass listed from least to most expensive in each category:
Non-conservation Grades
Regular - Blocks 45% of harmful UV rays
Ultra Vue - Anti-reflective, water white color, blocks 70% of harmful UV rays
AR Reflection-Free - Anti-reflective, blocks 78% of harmful UV rays
Conservation Grades
Conservation Clear - Blocks 99% of harmful UV rays
Conservation Reflection Control - Anti-glare, blocks 99% of harmful UV rays
Museum - Anti-reflective and blocks 99% of harmful UV rays
Optium - Non static, anti-scratch, anti-reflective plexiglass, blocks 99% of harmful UV rays*
*No other type of plexiglass should be used due to the large static charge in regular and UVplexiglass, unless at least a 1/2" spacer is used between the art and the glazing.
Michaels carries glass also made by Tru-Vu but under another name. Their Museum quality glass is called Masterpiece and goes down from there.
CHOOSING A MAT - Matting- mats are a personal preference. The main reason to use a mat is to keep the pastel painting away from the glass. Using a single, or double mat is also personal preference. I personally think a double mat looks nicer. Using mats will also make the overall framed size larger, which you may want because of a particular space it is going to hang. The larger the mat, frame & glass, the more expensive.
Mat color - try to choose a color that enhances the painting. Many people try to match it to their room or furniture. While this also may be personal preference, the painting will look better if you choose a mat color for it & not the room. Try to go with a neutral mat color. If you choose a double mat, the inner mat color could be a color chosen from within the painting.
Instead of a mat, you can have the framer use spacers to keep the painting away from the glass. This is a very acceptable way to frame a pastel if you don't want the look or cost of adding mats. It also gives the appearance of more of an oil painting because it does not have a mat.
Framing - The primary purpose of framing a painting is to put the focus on art work. For works on paper, framing is especially important to provide structure for the protection and preservation of the piece as well as to enhance its appearance.
Frames are also very personal. A painting's style should suggest the frame style. If your décor is contemporary you probably don't want to go with lots of gold filigree etc. Go for what looks best with the painting while lightly keeping the room in mind. Choose a frame finish that doesn't compete with the art in color or texture. For example, don't choose a fussy frame with a mottled finish to go with a busy image. Each work of art is its own universe. When the frame is selected to be of the greatest benefit to the art, the framed piece can be hung anywhere. Don't fall into the trap of choosing a frame to match others you already have; some of the most stunning groupings of paintings feature pieces in a wide variety of frame styles, sizes and finishes.
Larger paintings usually look best with wider moldings. A frame and its mat should never be the same width. There are no rules stating which should be wider-although it's often the frame.