This cover is very hard to get with a Todd McFarlane signature and a CGC grade of 9.8! Newton Rings (aka: rainbow or prism effect) is a normal result of the plastics CGC uses to encapsulate their comics.
There is no liquid present or anything that can damage the graded book. This visual phenomenon occurs when light passes through plastics with different refractive indexes (how they bend light). Its what you sometimes see on a smartphone screen protector, or on the edges of an LCD television screen.
In CGC's cases, its 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 Newton Rings present in all of CGC's encapsulated books, these are considered normal and acceptable. The item "Spawn 223 Walking Dead #1 cover homage CGC 9.8 signed by Todd McFarlane" is in sale since Thursday, February 15, 2018.
This item is in the category "Collectibles\Comics\Modern Age (1992-Now)\Superhero\Spawn". The seller is "comics2cyclists" and is located in Westminster, Colorado. This item can be shipped to United States.