Actually true original Silly Putty is different. I deleted my more extensive post from earlier when I noticed that someone had named Flubber. The original Silly Putty is actually a cross-linked polymer prepared by mixing boric acid and silicone oil. It was discovered during WWII during an attempt to synthesize a replacement for natural rubber. You are correct though in that searching for recipes for Silly Putty these are identical to those for Flubber. In chemical composition the original Silly Putty is different from Flubber.


The History of Silly Putty


I only came to know this after Googling to find out why what I thought was the answer, Silly Putty, was not correct.