Styropyro has several videos on this kind of "tips" from way back, he found in a compilation book from that period, filled with tips and tricks like this.
This is nowhere near the wildest stuff in there and many of the tips in there scare even styropyro.
And if you know what he does on his youtube channel, you know that's a feat.
No problem! I actually just got done watching all four of them lol. The multicolored coal in the fourth video was definitely the coolest thing. He managed to make a coal look like bismuth