replicating a similar effect like a slime

[somber token]

I want to be able to replicate having an element visible from the inside of the mob like a slime, I just need to have the color of the element inside not be affected by the outside element, so essentially if the inside color is white and the outside is red I would want the white color to be white when viewed from the outside and not a reddish white due to it being affected by the red

also I do know how to make something opaque like a slime but getting it like how I described I do not

[solemn root]

use the slime_outer for the outside and slime for the inside in your rp entity.json file