Hi,
I don't know of anything like you described being available commercially, but
I wanted to share something a lab I used to be in did years ago: we simply
took our glass flasks over to the glassblowing facility housed by our
chemistry department and had 3 half-inch indentation created in them around
the bottom of the flash...the effect was incredible, and the turnaround was quick.
Cheers,
Kiley Prilliman
