science

Pigment Yellow 74

Pigment Yellow 74 is a science 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 Yellow 74 rather than just read about it. In short: Pigment Yellow 74 (C.I. 11741) is an azo dye and classified as an arylide yellow. It is an intensely yellow-green solid.

Key takeaways

Pigment Yellow 74 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Pigment Yellow 74 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Pigment Yellow 74 from memory before moving on to harder problems.

Reference excerpt

Pigment Yellow 74 (C.I. 11741) is an azo dye and classified as an arylide yellow. It is an intensely yellow-green solid.

Extraction and presentation Pigment Yellow 74 is prepared by azo coupling of diazotization 4-nitro-o-anisidine to 2-acetoacetanisidide.

Properties Pigment Yellow 74 is a flammable, hardly flammable, yellow solid that is practically insoluble in water. It decomposes when heated above > 290 °C. It has a triclinic crystal structure with the space group P1 or space group P-1 and the lattice parameters a = 16.06 ± 0.16 Å, b = 7.71 ± 0.08 Å, c = 14.977 ± 0.15 Å. The crystals of the compound are pleochroism. In polarized light, they exhibit an orange glow when the long axis of the crystals is perpendicular to the plane of polarization, as opposed to the case where the long axis of the crystals is parallel to the plane of polarization. It is a flat molecule, enforced by the hydrogen-bonding via the ketohydrazide group.

Use Pigment Yellow 74 is used for printing inks and varnishs. The light fastness of fine-grained pigments of the compound is 2 to 3 fastness levels on the blue scale better than that of similar disazo yellow pigments, which is why these are preferably used when high light fastness is required, as is often the case in packaging printing. Similar to the other representatives of this pigment class, the solvent fastnesses are often less satisfactory. Prints with Yellow 74 pigment have poor calendering fastness and are not sterilizable. In contrast, like other monoazo yellow pigments, they are alkali-, acid- and soap-fast. Pigment Yellow 74 is a popular component of artist's paints and tattoo inks.

Regulation Pigment Yellow 74 is regulated in the course of the CoRAP by Italy. The use of Pigment Yellow 74 has been limited to 0.1% (1000 mg/kg) in permanent make-up or tattoo ink in the European Union since January 5, 2022.

References

Illustrations

Worked examples

Example 1 — a first encounter with Pigment Yellow 74

Start with the simplest possible case. Write down what Pigment Yellow 74 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Yellow 74 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 Yellow 74 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 Yellow 74

In research: Pigment Yellow 74 appears in science 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 Yellow 74 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 Yellow 74 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Arylide pigments, Shades of orange, so understanding it makes those chapters shorter.
In everyday life: Look for Pigment Yellow 74 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 Yellow 74 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Pigment Yellow 74 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 Yellow 74 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pigment Yellow 74 in simple terms?

Pigment Yellow 74 (C.I. 11741) is an azo dye and classified as an arylide yellow. It is an intensely yellow-green solid.

Why does Pigment Yellow 74 matter?

Because it connects several science 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 Yellow 74?

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 Yellow 74.