I guess the overall stance of CGC is that this acceptable from the email I received today:
Thank you for your email. What you are seeing is called the rainbow or prism effect, also known at Newton rings. There is no liquid present, or anything that can damage your book. This can occur when light passes through plastics with different refractive indexes (how they bend light). It’s what you sometimes see on a smartphone screen protector, or on the edges of an LCD television screen. In our cases, it’s the refractive qualities of the hard outer shell and the archival-quality Mylar sheets over the book, which have been approved by the Library of Congress for the preservation of paper.
There are acceptable levels of Newton rings in all of our encapsulated books. Re-holder service is available, and while we do our best to minimize the level of Newton Rings present, there is no guarantee this will correct or eliminate the Newton rings.
This is disappointing to say the least. Fortunately I scanned through the thread after I sent the first email and contacted Brittany and she is taking care of this for me. If it wasn't for Brittany we would basically be screwed. Thanks Brittany!