| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 1 | DF | TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15} |
| 138 | DF | .~ Iron group metal (Fe, Co, or Ni) {7} |
| 140 | DF | .~.~ Forming insoluble substance in liquid {4} |
| 146 | | .~.~.~ Sulfating {1} |
| 147 | DF | .~.~.~.~> Halogenating, hydroxylating, or hydrating |