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Processed sulfur: fine powder, yellow-brown. Made from sulfur and Beiting Sand. Grind, seal, sun-dry, then cal…

Processed sulfur: fine powder, yellow-brown. Made from sulfur and Beiting Sand. Grind, seal, sun-dry, then calcine. Exact ratios unknown. Ran multiple trials. Notes below. Initial test: #F1 part sulfur, 3 parts Beiting Sand Removed grit. Ground to powder. Low heat calcination. Smoke throughout. When the smoke cleared, retrieved the batch. Gray-white ash clumped inside. #FWrong. Second test: #F3 parts sulfur, 1 part Beiting Sand Removed grit. Ground to powder. Low heat calcination. Very little smoke. Retrieved. Yellow powder. Rubbed between fingers, it cakes into hard lumps. #FWrong. Third test: 4 parts sulfur, 5 parts Beiting Sand. Ground until I could not feel my arms... Wrong. Fourth test: 8 parts sulfur. Ground. Inhaled some by mistake. Passed out... Wrong. Fifth test: WRONG! WRONG! WRONG! ... 23rd test: 3 parts sulfur, 4 parts Beiting Sand. Low heat roast. A little smoke. Added 1 part millet, 0.2 parts honey. Smelled amazing. Dumped the powder. Ate the millet... Wrong. 34th test: Feng Jisheng, Feng Jisheng! It was only thirty-some failures. How did that break you? Get it together. Keep testing! 35th test: #F2 parts sulfur, 2 parts Beiting Sand Removed grit. Ground to powder. Used #FCharcoal as fuel. Blazing heat, hard roast! Smoke surged. Added more charcoal. Blazing heat, hard roast! Heat climbed. Added more charcoal. Blazing heat, hard roast! ... Addendum: The furnace cracked with a bang, loud as thunder. Thick black smoke filled the room. Soot caked Senior Brother Feng's face, pitch-black. To whoever comes after: #FDo not crank the heat up like this. Lei