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Bronze disease is the chloride corrosion of cuprous (copper-based) artifacts. It was originally thought to be caused by bacteria. [ 1 ] It is contagious in that the chlorides which cause it can spread the condition if they are brought into contact with another cuprous object. Despite its name, bronze disease can affect any copper-bearing alloy ...
Renaissance Wax is also commonly used in the preservation of bronze and copper coins. The wax seals the coins and helps prevent deterioration from moisture and air exposure. It may [citation needed] also help prevent the onset of the chloride-related corrosion commonly called bronze disease, although it won't arrest this once started.
A Byzantine follis of Constantine VII and Zoe. 914-919AD. 26 mm. The term "follis" is used for the large bronze coin denomination (40 nummi) introduced in 498, with the coinage reform of Anastasius, which included a series of bronze denominations with their values marked in Greek numerals. The fals (a corruption of follis) was a bronze coin ...
[6]: 132 Once used as a medicine [7] [8] and pharmaceutical preparation, [9]: 176 [10] verdigris occurs naturally, creating a patina on copper, bronze, and brass, and is the main component of a historic green pigment used for artistic purposes from antiquity until the late 20th century, including in easel painting, polychromatic sculptures, and ...
Gold, silver and bronze or copper were the principal coinage metals of the ancient world, the medieval period and into the late modern period when the diversity of coinage metals increased. Coins are often made from more than one metal, either using alloys, coatings (cladding / plating) or bimetallic configurations.
English: The coin had been immersed in an approximately 3% sodium sesquicarbonate/2% sodium bicarbonate w/v solution for four weeks to treat bronze disease. It had been rinsed four times previously and surface water patted off with the same crystallisation observed due to carbonates having infiltrated the coin's surface.
Ptolemaic coinage. A silver tetradrachm of Ptolemy IV Philopator (r. 221 – 205 BC); an undated issue from the Arados royal mint, struck c. 214–212 BC, 26 mm in width, 14.10 gm in weight; the obverse shows a diademed head of Ptolemy I Soter wearing the aegis, while the reverse shows an eagle standing on a thunderbolt with a Greek inscription ...
Room 49, British Museum, London [ 1 ] The Hoxne Hoard (/ ˈhɒksən / HOK-sən) [ 2 ] is the largest hoard of late Roman silver and gold discovered in Britain, [ 3 ] and the largest collection of gold and silver coins of the fourth and fifth centuries found anywhere within the former Roman Empire. [ 4 ] It was found by Eric Lawes, a metal ...