Travertine is a type of limestone that is formed by mineral deposits from natural springs. This sedimentary stone is created by the rapid precipitation of calcite. Other minerals mix together with the calcite to create unique swirls and movements that give the travertine its distinctive character and color. Rublev Colours Orange Travertine contains small amounts of iron oxide that imparts an oranges tint.
|Pigment Classification:||Natural Inorganic|
|Colour Index:||Pigment Red 102 (77491)|
|Chemical Name:||Iron Oxide|
|ASTM Lightfastness (based on pigment)|
|Physical Properties (mineral)|
|Particle Size (mean):||8 μ|
|Particle Size Range:||30 μ: 0.1% maximum|
|Refractive Index:||nω = 1.640–1.660 nε = 1.486|
|Oil Absorption:||24 grams oil / 100 grams pigment|
|Composition:||Calcium (Ca): 48.02% |
Iron (Fe2O3): 1.66%
Silica (SiO2): 0.94%
Sulfur (SO3): 0.43%
Aluminum (Al2O3): 0.38%
|Health and Safety||There are no acute or known chronic health hazards associated with the anticipated use of this product (most chemicals are not fully tested for chronic toxicity). Always protect yourself against potentially unknown chronic hazards of this and other chemical products by keeping them out of your body. Do this by avoiding ingestion, excessive skin contact, and inhalation of spraying mists, sanding dust, and vapors from heating. Conforms to ASTM D-4236.|
Origin and History
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Travertine was used in stone masonry dating back to the First Dynasty of Egypt in 3200 BC. The name ‘travertine’ is actually just a corrupted version of the Latin name, travertino, a derivation of the Latin lapis tiburtinus, which means ‘Tibur Stone.’ This is because travertine was first found in vast deposits by the ancient Romans in the city of Tibur, which is now known as Tivoli. Even today, Tivoli is one of the world’s leading travertine producers.
Travertine is a sedimentary rock formed by the precipitation of calcium carbonate minerals from freshwater, typically in springs, rivers, and lakes—surface and ground waters. In the broadest sense, travertine includes deposits in both hot and cold springs, including the porous, spongy rock known as tufa, and also the cave features known as speleothems (which include stalactites and stalagmites).
Both of the major calcium carbonate minerals, calcite, and aragonite, are found in hot spring travertines. Aragonite is precipitated when temperatures are hot, while calcite dominates when temperatures are cooler. When pure and fine, travertine is white, but often it is brown to yellow due to impurities, such as sulfur and ferric compounds, as found in our Orange Travertine.Source
Orange Travertine is from deposits in the Lori Province of Armenia.
|Names (primary mineral):||English: travertine |
|Nomenclature (primary mineral):|| |
Based on the colorant, iron oxide, and calcite mineral, this pigment has broad compatibility and permanence with all media. Iron oxide is very lightfast and stable outdoors and has excellent weatherfastness.Oil Absorption and Grinding
The oil absorption value for Orange Travertine is 24. This means 24 grams or milliliters (approx.) of linseed oil is required to form a coherent paste for every 100 grams of pigment. Travertine has a Mohs hardness of 4, which gives it the same abrasiveness as marble. This pigment is easy to grind into both waterborne and oil paint.Toxicity
Travertine is not considered a hazardous substance, however, care should be exercised when handling the pigment to avoid inhaling or ingesting the powder.