OK - if it crystal clear, it might be Zephyr, Aether, or Aion2.
Zephyr and Aether are both actually clear. Zephyr is the clear of choice for encasing, and Aether is a little different and will make a difference if you are encasing silver glasses. We will tackle those later.
Seriously. This rod, these pieces.
A silver rich color in a clear base, capable of producing blue and green fume effects and soft transparent pinks and purples. ... This new formula will replace Olympia Rain.
In my experience - it strikes to a lovely gold / yellow luster by itself, reducing it will get you a soft purpleish luster.
Try it over black or other colours to play with the transmitted vs reflected light aspect.
This is an easy, unfussy glass to use.