When was the recording of formula for gunpowder?

The earliest known formula for gunpowder was recorded in the 9th century during the Tang Dynasty in China. The Chinese alchemist Wei Boyang is often credited with formulating it in his text "Wujing Zongyao," which compiled military texts in the 11th century. Gunpowder, consisting of saltpeter (potassium nitrate), sulfur, and charcoal, revolutionized warfare and was later introduced to Europe in the 13th century.