Make the blob nucleus more visible

[Marquesas]

Aaaaaand we're back to square one.

Well, not completely. The iris itself could remain black which would still be visible on a gray blob.

Are you super duper sure that it can't be for all the organs, too? :c look how pretty it is!

Yes, this would bring several overlays into play for each object. Not fun.
Couple that with the fact that materials alter color so there's actual math involved.