science

Solvent Black 3

Solvent Black 3 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 Solvent Black 3 rather than just read about it. In short: Solvent Black 3 is an azo dye. It is a non-fluorescent, relatively thermostable lysochrome (fat-soluble dye) diazo dye used for staining of neutral triglycerides and lipids on frozen sections and some lipoproteins on paraffin sections.

Key takeaways

Solvent Black 3 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Solvent Black 3 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Solvent Black 3 from memory before moving on to harder problems.

Reference excerpt

Solvent Black 3 is an azo dye. It is a non-fluorescent, relatively thermostable lysochrome (fat-soluble dye) diazo dye used for staining of neutral triglycerides and lipids on frozen sections and some lipoproteins on paraffin sections. It has the appearance of a dark brown to black powder with maximum absorption at 596–605 nm and melting point 120–124 °C. It stains blue-black.

Applications Solvent Black 3 is used for a wide variety of commercial applications. In the laboratory, Solvent Black 3 is used for Sudan staining. Similar dyes include Oil Red O, Sudan III, and Sudan IV. It can be used to stain some other materials than the other Sudan dyes, as it is not so specific to lipids. It is used in fingerprint enhancement. It is useful for detecting fats that are contaminated with oil and grease. In differentiating haematological disorders, it will stain myeloblasts but not lymphoblasts. It was introduced by Lison and Dagnelie in 1935.

Production and composition Sudan Black is formed by coupling of diazotized 4-phenylazo-1-naphthylamine with 2,3-dihydro-2,2-dimethyl-1H-perimidine. Therefore, the main product expected was 2,3-dihydro-2,2dimethyl-6-[(4-phenylazo-1-naphthalenyl)-azo]-1H-perimidine. However the dye resulting from the above reaction product actually contains many, up to 42 colored and colorless by-products that can be fractionated. The two major products were blue in color confirmed by various chromatographic (TLC and column etc.) separation and spectroscopic (IR, NMR, Mass) identification were named SBB-I & SBB-II (Rf values of 0.49 and 0.19 (chloroform/benzene 1:1, SiO2) in thin Layer Chromatography). The above described product indeed turned out to be SSB-II which comprises up to 60% of the mixture, and the SBB-I was 2,3-dihydro-2,2-dimethyl-4-[(4-phenylazo-1-naphthalenyl)-azo]-1H-perimidine.

References

External links Stains File entry

Worked examples

Example 1 — a first encounter with Solvent Black 3

Start with the simplest possible case. Write down what Solvent Black 3 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 Solvent Black 3 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 Solvent Black 3 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 Solvent Black 3

In research: Solvent Black 3 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 Solvent Black 3 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: Solvent Black 3 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Azo dyes, Naphthalenes, Nitrogen heterocycles, so understanding it makes those chapters shorter.
In everyday life: Look for Solvent Black 3 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 Solvent Black 3 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Solvent Black 3 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 Solvent Black 3 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Solvent Black 3 in simple terms?

Why does Solvent Black 3 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 Solvent Black 3?

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 Solvent Black 3.