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Updated: April 30, 2025
It was known to many observers in the later years of the 17th century that the product of the calcination of a metal weighs more than the metal; but it was still possible, at that time, to assert that this fact is of no importance to one who is seeking to give an accurate description of the process of calcination.
To Lavoisier is usually attributed this test experiment; but the fact that the weight of a metal increases by calcination was established by earlier European experimenters, and, indeed, was well known to the Arabian chemists. Lavoisier, however, was the first to recognize its great importance. In his hands it produced a revolution in chemistry.
The reader will see, in the place quoted, or in the avant-propos to his Mémoire sur les Iles Ponces, the fact to be this; That the Chevalier Dolomieu finds those bodies which we either cannot melt in our fires, or which we cannot melt without changing them by calcination and vitrification, he finds, I say, these substances had actually been melted with his lavas; he also finds those substances, which are necessarily dissipated in our fires, to have been retained in those melted mineral substances.
An allied species is common on the coast of China, where the pearls are collected for export to India, to be reduced to lime by calcination for the use of luxurious betel-nut chewers. These almost microscopic pearls are also burnt in the mouths of the dead who have been influential and wealthy.
It seems clear to us that the one method of proving the accuracy of Mayow's supposition must be, to weigh a definite, combustible, substance say, a metal; to calcine this in a measured quantity of air; to weigh the product, and to measure the quantity of air which remains; to separate the product of calcination into the original metal, and a kind of air or gas; to prove that the metal thus obtained is the same, and has the same weight, as the metal which was calcined; and to prove that the air or gas obtained from the calcined metal is the same, both in quality and quantity, as the air which disappeared in the process of calcination.
When the lower portion of the heap has reached an advanced stage of calcination, a portion of the outer layer of lime sometimes slips down; if so, a fresh covering of earth must promptly be applied at the exposed point; otherwise it will serve as a vent for the heat, and the top and other sides will fail of proper calcination." Slaking Lime.
The fixed nature is likened to a serpent without wings; the volatile, to a serpent with wings: calcination unites these two into one. The second gate, Dissolution, is likened to death and burial; but the true Essence will appear glorious and beautiful when this gate is passed. The worker is told not to be discouraged by this apparent death.
Copper Venus was the basic metal, and Boyle started with vitriol or copper sulfate. He gave fairly explicit directions for the preparation, including calcination, boiling, drying, adding sal armoniack, subliming twice. The resulting chemical represented a purified medicine which he prescribed in variable dosage, from two or three grains, up to twenty or thirty at the maximum.
After the lectures you have attended, and the experiments you have seen! After I have heard you myself, when the whole of my right side has been benumbed, going on with your master about combustion, and calcination, and calorification, and I may say every kind of ation that could drive a poor invalid distracted, to hear you talking in this absurd way about sparks and ashes! I wish, whimpered Mrs.
More than that, they were human bones; though whether the remains of one man, or of two or three men, what with calcination and ashes, and what with a poor practical knowledge of anatomy, I can't undertake to say. When I got aboard again I opened the bottle, which was oilskin-covered as you see, and glass-stoppered as you see.
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