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Books Bücher 1 - 5 von 5 in ... valuable stones are from India. Some of the pieces of sardonyx used by the ancient...
" ... valuable stones are from India. Some of the pieces of sardonyx used by the ancient engravers for their most important works were of enormous dimensions. At the present day onyxes and sardonyxes are imported from Germany, but their colours are produced,... "
A Treatise on the Building and Ornamental Stones of Great Britain and ... - Seite 179
von Edward Hull - 1872 - 333 Seiten
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Antique Gems: Their Origin, Uses, and Value as Interpreters of Ancient ...

Charles William King - 1860 - 498 Seiten
...black and white layers. These colours are produced artificially by boiling the stone, a kind of flint, for several days in honey and water, and then soaking...in sulphuric acid to bring out the black and white, and in nitric to give the red and white layers. They all come from Germany, where the secret was cither...
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A Glossary of Mineralogy

Henry William Bristow - 1861 - 420 Seiten
...for their rarity only, but for their beauty as works cf art. See ONICOLO, also SARD. The tints of the Onyx may be heightened by boiling it for several days in honey ard water, and then soaking it in sulphuric acid to bring out the black and white layers; or in nitric...
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Handbook of Archæology: Egyptian--Greek--Etruscan--Roman

Hodder Michael Westropp - 1867 - 458 Seiten
...imported from Germany, but their coloxirs are produced artificially by boiling the stone, a kind of flint, for several days in honey and water, and then soaking...in sulphuric acid to bring out the black and white, arid in nitric to give the red and white layers. They are, however, considered of little value. •...
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Economic geology, or Geology in its relations to the arts and manufactures

David Page - 1874 - 336 Seiten
...white, are the most frequent alternations of colour ; but these can be intensified by boiling the stone for several days in honey and water, and then soaking it in sulphuric acid. Opals. . "TheOflals, or Opaline varieties, are, as already stated, hydrous silicas, consisting of from...
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Handbook of Archaeology: Egyptian-Greek-Etruscan-Roman

Hodder Michael Westropp - 1878 - 600 Seiten
...imported from Germany, but their colours are produced artificially by boiling the Btone, a kind of flint, for several days in honey and water, and then soaking...in sulphuric acid to bring out the black and white, and in nitric to give the red and white layers. They are, however, considered of little value. ACHATES...
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