DrNikolai Posted June 29, 2023 Share Posted June 29, 2023 I recently picked up a CGC slab from one of my LCS and noticed this strange bubbling/rippling effect that goes the full length of the inner well. It kind of looks like dried up glue, but I didn’t think CGC glues their inner wells. It’s not touching the book at all, but I have no idea what it is. Can anyone help me figure what this is and whether I should be concerned? Link to comment Share on other sites More sharing options...
theCapraAegagrus Posted June 29, 2023 Share Posted June 29, 2023 The sonic weld process is nothing new for CGC slabs... Link to comment Share on other sites More sharing options...
DrNikolai Posted June 29, 2023 Author Share Posted June 29, 2023 Got it. I wasn’t aware that the sonic welding process can result in the streak. Also glad to know it doesn’t do damage to the book nor detract from the book’s value. Thanks! Link to comment Share on other sites More sharing options...
