Tuesday, May 10, 2022

Why Resin Yellows and What You Can Do to Avoid It

If you've been working with resin for a while, you might have noticed some of your earliest pieces just don't seem to have the clarity of your most recent pieces... they seem to be slightly discoloured or they've taken on a yellowish tinge. As disappointing as it is, this is actually a normal phenomenon.  It's a fact that all resins will yellow... eventually!  For some resins, that can be as little as a few months. For other resins, it can be a number of years.  You may have seen resin kits where one part of the resin looks slightly yellow. The yellowing usually occurs in the hardener side first, due to the amines that are present. Without getting too technical, when they're exposed to oxygen (like when you open and close the bottle), they oxidise, or turn brown. That's why RESIN HAS A SHORT SHELF LIFE. But just because your resin hardener has yellowed , doesn't mean you have to discard it...