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Since the excess of both the gaseous reducing agents can only be expelled by boiling, with consequent uncertainty regarding both the removal of the excess and the reoxidation of the iron, zinc or stannous chlorides are the most satisfactory agents. For prompt and complete reduction it is essential that the iron solution should be brought into ultimate contact with the zinc.
If a portion of the wood is raised in temperature to a certain point, the elements begin to combine with the oxygen near, with so much violence as to release the reserved power with great rapidity. And as this force re-appears in the form of heat, the next portions of the wood are at once raised to the right temperature to allow the process of reoxidation to go on rapidly with them.
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