chemistry

Viridian

Viridian is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Viridian rather than just read about it. In short: Viridian is a blue-green pigment, a hydrated chromium(III) oxide, of medium saturation and relatively dark in value. It is composed of a majority of green, followed by blue.

Key takeaways

Viridian belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Viridian to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Viridian from memory before moving on to harder problems.

Reference excerpt

Viridian is a blue-green pigment, a hydrated chromium(III) oxide, of medium saturation and relatively dark in value. It is composed of a majority of green, followed by blue. The first recorded use of viridian as a color name in English was in the 1860s. Viridian takes its name from the Latin viridis, meaning "green". The pigment was first prepared in mid-19th-century Paris and remains available from several US manufacturers as prepared artists' colors in all media.

History Viridian pigment was first prepared in 1838 in Paris by Parisian color chemist and painter Pannetier alongside his assistant Binet as a hydrated form of chromium oxide. The preparation process was demanding, expensive, and shrouded in secrecy. The French chemist C. E. Guignet developed and patented a cheaper manufacturing method in 1859 that enabled larger distribution and use of the pigment. This method involved calcining a combination of boric acid and potassium bichromate, then washing the material. Winsor and Newton's catalogue listed the pigment as early as 1849. It was used as early as 1840 in a work by J. M. W. Turner. Viridian was in prominent use by the mid-nineteenth century, but was less popular than three to four times more affordable alternatives including emerald and chrome greens.

Visual characteristics

Viridian is a bright shade of spring green, which places the color between green and teal on the color wheel, or, in paint, a tertiary blue–green color. Viridian is dark in value, has medium saturation, and is transparent.

Variations of viridian

Paolo Veronese green

Paolo Veronese green is the color that is called verde veronés in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm. Paolo Veronese green was a color formulated and used by the noted 16th-century Venetian artist Paolo Veronese. Paolo Veronese green began to be used as a color name in English sometime in the 1800s (exact year uncertain). Another name for this color is transparent oxide of chromium.

Viridian green

At right is displayed the color viridian green.

Generic viridian

Generic viridian is the color that is called Viridian inspecifico in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm.

Spanish viridian

Spanish viridian is the color that is called Viridian specifico in the Guía de coloraciones (Guide to colorations) by Rosa Gallego and Juan Carlos Sanz, a color dictionary published in 2005 that is widely popular in the Hispanophone realm.

Permanence Viridian is considered durable and permanent as an artist's pigment. Viridian is unaffected by temperatures up to 260 °C (500 °F), but it is unsuitable for use in ceramic glazes. Viridian is compatible with all pigments in all media, and has high oil absorption. Pure pigment formulations of viridian are hard and may separate in tubes, but adding barium sulfate in small quantities enables easy grinding and dispersion.

Notable occurrences

Fine art painting Fritz Bamberger, Afterglow in the Sierra Nevada, 1863. Claude Monet, Arrival of the Normandy Train, Gare Saint-Lazare, 1877, oil on canvas includes traces of viridian in the grassy area. Pierre-Auguste Renoir, Flowers, 1919.

See also List of colors List of inorganic pigments Green pigments

References

External links "Viridian, Pigments through the Ages". www.webexhibits.org. Webexhibits. "Viridian". colourlex.com. Colourlex. "Viridian". www.figma.com. Color in design.

Illustrations

Worked examples

Example 1 — a first encounter with Viridian

Start with the simplest possible case. Write down what Viridian claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Viridian before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Viridian ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Viridian

In research: Viridian appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Viridian in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Viridian is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chromium(III) compounds, Inorganic pigments, Quaternary colors, so understanding it makes those chapters shorter.
In everyday life: Look for Viridian outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Viridian in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Viridian means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Viridian out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Viridian in simple terms?

Viridian is a blue-green pigment, a hydrated chromium(III) oxide, of medium saturation and relatively dark in value. It is composed of a majority of green, followed by blue.

Why does Viridian matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Viridian?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Viridian.