User blog comment:Elijahhee/What is this $hit!? On gunpowder for Chinese and Mongols/@comment-34147723-20190307005201/@comment-26842175-20190307201558

I don't know if you are a flat-earther, but you can also use any search engines to find the results yourself. However it will always be the internet and even things in books can be wrong. The only real solution is visiting China and talking to expert and checking some cannons out and use scientific methods to determine their age.

Here is another source: https://www.quora.com/Why-did-the-Chinese-invent-gunpowder-but-did-not-use-it-in-warfare.

However I won't keep trying to convince you and this is my final attempt. I guess you should try to determine for yourself if they used canons or not.