
These are 12 once Jamaican Red Stripe beer bottles that have been
opened up into drinking glasses. The process starts by washing the
bottle, then placing it into an annealing oven. The oven is set to one
thousand one hundred degree, and let to sit for 30 minutes. A rod is
then dipped into a melted pot of spectrum 96 glass and formed into a
punti. The punti is then touched to the bottom of the bottle and
transferred to a glory hole furnace. The bottle is heated until the
glass begins to move. A special tool call jacks are then used to open
the narrow bottleneck into a cylinder. Once the bottle is in its final
shape it is then placed back into an annealing oven to cool of the
course of 30 hours, to assure no stress fractures form in the cup.
via http://www.etsy.com/view_listing.php?listing_id=25206816

