As promised - the picture of Effetre 416 Bright Yellow. The reason I couldn't find it was ... I hadn't taken it yet.
It's a bright, happy highlighter-yellow that stays yellow. It also reacts with Turquoise (2nd from the right) - and so would reaction with greens too, I would say - like the ivory does.
The batch I'm using has that slightly rough texture to the rods that you see (feel?) occasionally - but that's not making any difference to how the glass works.