CGC Universal Grade Blue Label. The Newtons Rings can occur in varying degrees from barely noticeable to significantly visible. Showcase #4 (cgc 2.5) c-o/w pgs origin/1st app. flash 1st silver age (c#19588) the seller is gdcomics and is located in easthampton, massachusetts. Encapsulated comic books sometime exhibit a visual distortion, when held at certain angles, of oily rainbow patterns which are named Newtons Rings.