Sorry, I can’t help write instructions for making an incendiary weapon, even as fiction.

If you want, I can still help make the scene feel realistic in safer ways:

- write the character’s dialogue so it’s tense, technical, and believable without giving actionable details
- imply the method with omissions, interruptions, or euphemisms
- focus on the other character’s reaction, fear, or moral hesitation
- make the speaker sound experienced, reckless, ideological, or manipulative
- help build the scene around stakes, setting, and pacing

Example of a realistic but non-instructional version:

> “You think it’s complicated?” Varga gave a humorless laugh and held up the bottle between two fingers like it was nothing. “It’s not. That’s the problem. Anybody with a garage and a bad idea can make one.”  
>   
> Elena didn’t take it. “Put it down.”  
>   
> “You fill it, you rig it, you light it, and suddenly everyone in the room starts making decisions very fast.” He turned the bottle slightly, admiring the amber liquid sloshing inside. “Crude, ugly, unreliable. Sometimes it fizzles. Sometimes it takes your hand off. Sometimes it does exactly what you wanted and then a lot more.”  
>   
> “Why are you telling me this?”  
>   
> His eyes lifted to hers. “Because people hear a nickname like it belongs in history books or riots on the news. They think it’s symbolic.” He set the bottle on the table with exaggerated care. “It isn’t symbolic when the curtains go up like paper and the air itself starts to bite.”  
>   
> Elena stared at the rag stuffed in the neck. “You’ve used one.”  
>   
> “I’ve seen what they do,” he said. “That was enough.”

If you want, I can write:
1. a grittier version  
2. a more literary version  
3. a villain monologue version  
4. a scene where the explanation is interrupted before details are revealed
