Make white molecular particles on the outside and red on the inside? I have been struggling to try to make the inside of my molecular mannequin red (to sort of representing blood) and the outside white. For a reference ...

I have now aimed for a collection of white/red spheres, have tried count, random, and so on without coming close to what I want.
I want to render it in Eevee any suggestions? Something I can do in the shading tab?
Here is my try ...
I'm not sure if reference object in your linked video is done by the same way, but you can try ...

for outer particles - add Solidify modifier to your object
for inner particles - copy outer object, Apply modifier, go to edit mode select one outer vertex, select Linked L, delete, Recalculate Normals Shift+N

Like this you create &quot;inset&quot; object without overlapping particles.

Enable under Collision

Activate Collision with others
Enable under links
Activate Particles linking with others