Insane. I had a few various grades and sold them a few years back. While the book is cool I remember a dude in Chicago who sold on eBay and sold a couple, got to talking to me and told me how he figured a way to make them himself. I called bull on it but he did send me a photo of close to 20 black error venoms he had almost all appearing similar to one another. He had a few graded ones too most of which were high grade. When I asked how he was able to produce the error effect without leaving a trace, he wouldn’t tell me, just told me a butt load of the ones in the market are probably ones he sold to unsuspecting buyers. So idk which are authentic or made by some dude anymore.