Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
Spanish Tutania
If 8 ounces of iron or steel be melted with 16 ounces of antimony and 3 ounces of nitre, by adding the latter ingredients in small pieces after the steel is white hot a hardening is made, of which 1 ounce is sufficient to harden 8 ounces of tin. See TUTANIA.
Spathic Iron Ore is the purest variety of clay iron-stone in which the metal occurs as a ferrous carbonate. A considerable proportion of the pig iron produced in England is smelted from these ores, the inferior grades of which constitute the clay ironstone and blackband ironstone of the coal-measures. See ORES.