Time between flashes

[Sean Jones]

How is this possible?
This guy puts on a collar, stem, foot and then transfers to the pointy without flashing. Over three and a half minutes out of the glory hole but survives the reheat.
https://youtu.be/RBApTX5M-3k

[Eben Horton]

Simon Pearce melts a barium crystal (or at least they used to).

I don’t know what type of glass you melt, but different glasses have different working properties.


That goblet’s bowl was on the thick side and that gave him some time. Also, if you have a very tight jacks line, with a soft shoulder and no sharp angles, you can cheat things and get away with letting that bowl get much cooler than you can get away with if you had a wider jack line.

I worked with Bill Gudenrath every Thursday for 3 years and this is just one of the ten million things that he taught me.

[Pete VanderLaan]

I , for a time blew a cup without ever reheating it on the pipe. Then after the transfer and opening the cup completely, I put it in the lehr. No reheat.

The next day, I put the piece in a polariscope and there was a perfect black "X" thru the punty.

After that, I reheated just before putting it away. The next day, no X.

Glasses with high lithium contents really resist this type of thermal shock. I can' attribute that to barium but lead does resist checking. Barium looks a lot like lead when you check out its pedigree.