chemistry

Pigment Violet 29

Pigment Violet 29 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 Pigment Violet 29 rather than just read about it. In short: Pigment Violet 29 (C.I. 71129) is an organic compound that is used as a pigment and vat dye. Its colour is dark red purple, or bordeaux.

Key takeaways

Pigment Violet 29 belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Pigment Violet 29 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Pigment Violet 29 from memory before moving on to harder problems.

Reference excerpt

Pigment Violet 29 (C.I. 71129) is an organic compound that is used as a pigment and vat dye. Its colour is dark red purple, or bordeaux. Structurally, it is a derivative of perylene, although it is produced from acenaphthene. It is a less common dye compared to related derivatives such as pigment red 190 (Vat Red 29).

Violet 29 is used in watercolors, acrylic paints, automotive paints, inks for printing and packaging, cleaning and washing agents, pharmaceuticals, solar cells, paper, sporting goods, industrial carpeting, and food packaging.

Toxicology Violet 29 is derived from perylene, a polycyclic aromatic hydrocarbon. Perylene is less toxic than its well-studied cousin benzo[a]pyrene. Little is known about the compound's mechanism of toxicity, so US EPA findings are based on occupational hazard studies. Violet 29 is highly insoluble in water and octanol, so any exposure routes are considered to be by inhalation of dust. Thus, the EPA determined that occupational exposure was realistically the only way toxic levels could be reached in any group.

EPA risk review Violet 29 is under risk evaluation review by the EPA as part of the Toxic Substances Control Act (TSCA). In early 2021, the EPA Final Risk Review found "no unreasonable risk" to the environment, consumers, bystanders, or the general population for any conditions of use for Violet 29. However, the EPA found an "unreasonable risk" to workers from the domestic manufacturing or import of the chemical and nearly all uses and disposal. This finding under the TSCA is for alveolar hyperplasia, inflammatory and morphological changes in the lower respiratory tract for chronic inhalation exposures. The finding of "unreasonable risk" requires the EPA to work to reduce or manage the risk, including banning the use of a particular chemical.

References

Illustrations

Worked examples

Example 1 — a first encounter with Pigment Violet 29

Start with the simplest possible case. Write down what Pigment Violet 29 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 Pigment Violet 29 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 Pigment Violet 29 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 Pigment Violet 29

In research: Pigment Violet 29 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 Pigment Violet 29 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: Pigment Violet 29 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Heterocyclic compounds with 7 or more rings, Imides, Perylene dyes, so understanding it makes those chapters shorter.
In everyday life: Look for Pigment Violet 29 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 Pigment Violet 29 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Pigment Violet 29 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 Pigment Violet 29 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pigment Violet 29 in simple terms?

Pigment Violet 29 (C.I. 71129) is an organic compound that is used as a pigment and vat dye. Its colour is dark red purple, or bordeaux.

Why does Pigment Violet 29 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 Pigment Violet 29?

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 Pigment Violet 29.