“The master was an old Turtle--we used to call him Tortoise--'
Why did you call him Tortoise, if he wasn't one?' Alice asked.
We called him Tortoise because he taught us,' said the Mock Turtle angrily; 'really you are very dull!'
You ought to be ashamed of yourself for asking such a simple question,' added the Gryphon; and then they both sat silent and looked at poor Alice, who felt ready to sink into the earth.”
― Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass
On the right you can see the end of the cooled, melted rod, showing a soft green, pale blue, and purple shading to brown.
So right off the bat - you know you are going to have some fun with this one!
In fact - the first thing I start thinking is how much this colour reminds me of Effetre 219 Copper Green.
So, harkening back to "what do we do with copper green" - why, I tried some dots of EDP, of course! And yep - they do look a lot like EDP on Copper Green. Above, on mandrel, still hot, before kilning, and below, annealed. That's just a base of tortoise, with dots of EDP (Effectre 254 - Evil Devitrifying Purple) on it, melted in. Nothing else.
As you can see from CiM's page on tortoise, this glass has lots of potential to, er, "taught us" new stuff.
I like the organic colour of it (despite not being a big fan of opaque green), and look forward to playing with this one. It's quite extraordinary to watch when hot - it goes white after being heated to red hot, then cools to blue / grey, and then eventually goes green. It will strike back to green in the kiln, even if you put it in the kiln still white.