When Burn Stewart approached Allied Glass to develop a limited edition bottle for its Tobermory 15-year-old single malt whisky, it presented the Yorkshire-based manufacturer with a design challenge that would require a number of complex manufacturing techniques. Burn Stewart requested that the bubbles within the glass should be in a random pattern to create unique bottles. Achieving the desired effect on the bottle, which also uses embossing, meant the glass had to operate at a higher temperature than usual. Allied's production team also had to adjust the orifice size, the plunger size and stroke differential to give the gob of glass and long "dog bone" shape, which would give a folding effect on delivery to the IS machine. This technique then generated the individual blisters and markings required.
