Stone Road (STONE (ストーン) ROAD (ロード) Sutōn Rōdo) is the twentieth chapter of the Dr. Stone manga.


Senku and the rest decide to make Sulfonamide. Chapter 20 page 10

  1. Electricity
    • Start with Iron
    • Powerful Magnets
    • Copper
    • Phosporus
  2. Chlorosulfuric Acid
    • Salt + Sulfuric Acid = Hydrochloric Acid
    • Salt + Electricity = Sodium Hydroxide
    • Sulfuric Acid + Sodium Hydroxide = Sodium Hydrogen Sulfate
    • Hydrochloric Acid + Sodium Hydrogen Sulfate = Chlorosulfuric Acid
  3. Ammonia
    • Urine
  4. Aniline
    • Coal
  5. Sodium Bicarbonate
    • Alcohol (Carbonation) = Sodium Bicarbonate
  6. Acetic Anhydride
    • Alcohol to Vinegar = Acetic Anhydride

Chrome and Kohaku learn the earth is rotating. Then Senku pointed out the "north star" but according to Kohaku and Chrome (using a magnet), that is not north based on perception. So Senku realized that his trip to Hagone was off since the planet's axis has titled in 5739 years.

Senku questions how Kohaku knew north was different and Chrome reveals it was due to magnets. He, Kohaku and Chrome then decide to look for iron sand.

Characters in Order of Appearance


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