Li Shimin's eyes lit up upon hearing this.

"Yes!"

"If even I don't use it, how dare the common people?"

"Men, bring two cartloads of honeycomb briquettes from the Prince of Qin's residence. I want to test them myself!"

"promise!"

Before long, the Hundred Cavalry brought two carts of honeycomb briquettes from the Qin Prince's mansion, along with a dozen or so cast iron furnaces.

Li Shimin stared blankly at the iron stove and the black coal briquettes.

How do you use this?

Upon hearing this, Zhang Anan smiled and stepped forward.

"Your Majesty, this servant knows how to use this!"

"Simply assemble the stove, put the honeycomb briquettes inside, and then light it with a match..."

"matches?"

"Oh, this is the eldest grandson's latest invention. It's much better than the tinderbox we usually use!"

Zhang Anan skillfully took out a match, then lightly struck it on the matchbox, and with a hiss, a small flame ignited.

Zhang Anan carefully protected the flame and threw it into the hole of the honeycomb briquette. Soon after, a small flame shot out from the hole.

"Your Majesty, look! The honeycomb briquettes are on fire!"

Upon hearing this, Li Shimin hurriedly went forward to check and saw that the black honeycomb briquettes were indeed burning brightly, and there was no toxic smoke being emitted.

However, Li Shimin still dared not promote it rashly, fearing that this thing would produce no smoke outdoors, but would produce smoke indoors.

"Guards, take this item to my palace!"

"promise!"

Before long, several riders carried an iron furnace to the Ganlu Hall.

Li Shimin had the stove burn for half an hour, and seeing that he did not smell any smoke, he immediately ordered someone to light a few more.

He was relieved when he saw no pungent smoke even after five stoves were lit in the Ganlu Hall.

"good!"

"This stuff is really good. Not only does it burn longer than charcoal, but what's even more remarkable is that it doesn't have any strange smell at all!"

"By the way, how much does this item cost?"

"If it's too expensive, my people won't be able to afford it!"