Double Helix Thallo is a medium transparent emerald green. It is a reduction glass, and Double Helix calls it a "super lustre."
I found it to be quite subtle in it's effects - although it easily produces a nice gold lustre, and some blues and purples possible.
Note - the smooth leaf shape to the left was not annealed, and appears to have retained more of it's lustre than the annealed shapes.
If you want to retain some of the character of the original colour of the glass - the green-ness - or if the very strong reduction effects overwhelm your designs, then you might appreciate the subtlety of this one.