The blue hue is part of the texture sheet of the fire.
You could get a mod that properly recreates the particle sheet with the same amount of fire particles, but with the blue hue on it.
(Texture only, without editing particles. Which would make it compatible with this mod.)

Assuming most people just load the texture in gimp or photoshop, edit, and save it.
I've seen this a lot in the past decade.

But particle sheets like this have extra "index data" saved within that must be re-created by running each individual fire tga, along a text file, through a tool called mksheet.exe.
Cause editing the vtf as is just deletes all that info, which causes the particles to eventually break and instead of "one flame" you have the entire texture with all the flames on it.

*theres 2 mods that recreate it but both have different issues*

i do like how much more saturated this looks, but ive always felt l4d2s fire particles lacking. l4d1s seems to have more smoke and ember particles, along with a blue hue at the bottom of the fire. theres a mod that recreates the l4d1 particle effect but has some issues.

No, it does not. I thought about adding it, but i haven't spent any time on figuring out how it works.

Respect with great author of L4D addon community. Is this overhaul includes haze(heat shimmer) effect? Like Spitter cut effect has?

The saturation fits perfectly with L4D1's campaigns. A strong warm hue contrasting against the blue tones.

i love it

good guys

I'd imagine this isn't usable with the blue fire mod, but its dope

now thats hot

nice

Hot