Beat the iron into thin slices, grind it, sprinkle it with salt water, soak it in vinegar jar, and put it in the shade for about 0/00 day. Take out the rusty clothes and grind them into fine powder.

Expansion: Manufacturing method of iron oxide powder: take steel forging leaves such as water or balls, grind the flat surface to make it smooth, sprinkle with salt water, and bury it in the shade of vinegar urn for 100 day, and iron oxide will be finished. Scrape a finer sieve, put it into a mortar and grind it into flour, and mix the drugs into pills and powders. This essence of iron is more effective than iron powder.

Tiehua powder, the scientific name of traditional Chinese medicine. Alias iron powder and paste. It is rust powder formed by iron and acetic acid. Distributed all over the country. It has the effects of nourishing blood, tranquilizing mind, calming liver, relieving convulsion, removing toxic substances and relieving swelling. Indications: blood deficiency, sallow and emaciated, fright, madness, forgetfulness, proctoptosis, hemorrhoids and urine leakage.

Characteristics of medicinal materials: this product is powder, reddish brown. No metallic luster. Heavy body, easy to touch hands. Slight breath, sour taste. Preferably reddish brown, without impurities.