I’ve not come across blue glass quite so easily since I started cutting bottles, and am always keen to get more as the results look good. I could go out and buy blue glass bottle products, of course, but that’s kind of defeating the object of having a free cost material to work with.
I received a second blue bottle of Ty Nant spring water, which is a teardrop shaped glass bottle with a long narrow neck. The first one I tried turned out to be a bit of a disaster, and ran in all sorts of directions, including in straight vertical lines down the bottle when heated, which is something I’ve not come across before. Four attempts to salvage something from the bottle with fresh spaced cuts down the bottle all failed and it was a dead loss. I was left wondering if the shape of the bottle was a problem in terms of adding stress to the glass, as the straight runs particularly at the neck curve were quite explosive under the warm water pouring. Or was it maybe a peculiarity of heating blue glass, as I had also a lot of problems with the Blue Nun bottles, which were regular cylindrical shapes, though quite uneven. Time will tell as I learn more through practise, but blue glass is something I’m going to attempt very carefully to try to increase the chances of success than I’ve had so far.
So on my second attempt at a Ty Nant blue bottle, I first tried to remove about 80mm from the narrow neck at the top, using the G2 cutter. I positioned the cutting wheel so there was a clear contact , though this was not so easy given the curving nature of the glass. The score line was good, and I began to gently heat the glass with the hot water for a couple of rotations. Then on quenching under a cold running tap, the reflection of a clean break could be seen, but not all the way around, and by then the temperatures had fallen, so it was back to reheating. This is the point where it is more vulnerable, as a single clean break all the way round first time seems to produce the best results. On the second quench, it began to run off, so I stopped immediately, and dried the bottle for a second cut further down the bottle.
Second time around was successful, as can be seen from the photo above. I left a good 40mm or so from the failed cut, as I knew the likelyhood of a vertical split was high. I heated the glass gently, but for longer, and got a visible break first time all the way round the circumference under quenching. A second gentle heating then cleanly separated the two halves. I edged down the top very carefully and patiently indeed, using three grades of diamond pads in a bowl of warm water. I really didn’t want any slips, and subsequent scratches to spoil this piece. It went well, and I’ve got another very attractive blue glass item. It makes for a good vase (140mm high, around 80-90mm wide).