How can i make a specific part of a material glow?

Question

I am trying to create a model of the alphabet 'A'. is there a way to make only the blue color glow? leaving the pink as it is. I tried using 2 different shaders, principled bsdf and emission shader and then joining both with a mix shader but the result was awful.

Answer 1

you could use this material setup:

compositor nodes:

to get this:

Of course you can change the "greater than" threshold and the "multiply" value to tweak your result, as well as changing values in the glare node.