A premium Johnnie Walker Blue Label bottle gets a second life as a custom rocks glass. The process is all about precision. The bottle is carefully scored on a cutting jig with a diamond blade, then exposed to boiling water followed by an ice bath. The sudden thermal shock forces the glass to split cleanly along the etched line. At that stage, the rim is dangerously sharp, so it’s leveled on a glass-sanding disc and slowly refined with finer grits until it’s smooth, rounded, and safe to drink fro