You may have heard the term “Support Induced Discoloration” or SID in relation to sealing panels or even gessoing a canvas. And SID is the one reason that Ampersand encourages sealing panels before priming, but what does it really mean and how does it effect art long term?
Support Induced Discoloration is a relatively new concept to the art world, new because acrylic dispersion paints are new. Support Induced Discoloration occurs when acrylic paints change color due to pulling up toxins or residue in the substrate. The fluids in the paint leach into the substrate, through the primer and pull up the residue, leaving behind particulate in the paint that discolors it. This is most apparent in transparent gels and mediums but also occurs to pigmented paint. Gesso or primer is not sufficient in preventing discoloration, so sealing or sizing is always recommended.
You can prevent SID from affecting your own work by properly sealing wood panels before use. For more information on Sealing (or sizing) panels, refer to our previous post:
Painting on panel sizing. OR, You can purchase one of Ampersand’s already sealed and primed panels, such as Gessobord™, Encausticbord™, Claybord™, Aquabord™ or Scratchbord™. All of these panels have been sealed with Ampersand’s Archiva-Seal™ technology.
In the early 1990’s, Golden Artist Colors did some significant research with Buffalo State College to discover support induced discoloration and test the degrees of discoloration on different supports, with different acrylic mediums and primers. The results from these experiments led to what we know today about SID.
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