Indicator icons dark on dark

I am curious I have 2 apps running where the indicator icons are dark on dark -- Caffeine and Sound applet. I looked in my icon file and I see light coloured icons but have no idea how to choose light for dark theme. There are multiple copies of the icons that seem to show current status of applet.

2022-08-11 08_18_38-1.png - IrfanView (Zoom_ 852 x 479)

Both icons have changeable icons based on status, on or off and with the speaker, increase in volume shows on the icon itself. Or are these not dependent on the icon theme chosen? I am using MC-OS-Mojave dark. It could be just the theme itself, so I am looking to over-ride the icons for these 2 applications.

This is theme related. If I use Yaru MATE dark the icons are all visible. Turns out the issue is with the Nitrux icon theme...