Help with Plasma 6 panels and colours

I upgraded from Kubuntu 24.04 to 24.10 and have been moved to plasma 6. Before this I used latte, but the lack of development there means it’s just never going to work in 24.10. So I’ve been tweaking my setup for days now. I really want a dark translucent(ish) panel, but every time I create one my taskbar icons remain dark:

image

What controls the colour of those icons? If I can sort that out I may be able to stop playing around and just try living with it for a few days!

Your icon theme mostly. You could, kinda, cheat by adding a color file to the plasma desktoptheme. In that file you wanna have a look at:
[Colors:Window]
ForegroundNormal=r,g,b color

Keep in mind that that value will change any foreground color in the plasma theme. For example: