science

Tincture

Tincture 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 Tincture rather than just read about it. In short: A tincture is typically an extract of plant or animal material dissolved in ethanol (ethyl alcohol). Solvent concentrations of 25–60% are common, but may run as high as 90%.

Key takeaways

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

Reference excerpt

A tincture is typically an extract of plant or animal material dissolved in ethanol (ethyl alcohol). Solvent concentrations of 25–60% are common, but may run as high as 90%. In chemistry, a tincture is a solution that has ethanol as the sole solvent. In herbal medicine, alcoholic tinctures are made with various ethanol concentrations, which should be at least 20% alcohol for preservation purposes. Other solvents for producing tinctures include vinegar, glycerol (also called glycerine), diethyl ether and propylene glycol, not all of which can be used for internal consumption. Ethanol has the advantage of being an excellent solvent for both acidic and basic (alkaline) constituents. A tincture using glycerine is called a glycerite. Glycerine is generally a poorer solvent than ethanol. Vinegar, being acidic, is a better solvent for obtaining alkaloids but a poorer solvent for acidic components. For individuals who choose not to ingest alcohol, non-alcoholic extracts offer an alternative for preparations meant to be taken internally. Low volatility substances such as iodine and mercurochrome can also be turned into tinctures.

Characteristics Tinctures are often made of a combination of ethyl alcohol and water as solvents, each dissolving constituents the other is unable to, or weaker at. Varying their proportions can also produce different levels of constituents in the final extraction. As an antimicrobial, alcohol also acts as a preservative. A downside of using alcohol as a solvent is that ethanol has a tendency to denature some organic compounds, reducing or destroying their effectiveness. This tendency can also have undesirable effects when extracting botanical constituents, such as polysaccharides. Certain other constituents, common among them proteins, can become irreversibly denatured, or "pickled" by the alcohol. Alcohol can also have damaging effects on some aromatic compounds. Ether and propylene glycol based tinctures are not suitable for internal consumption, although they are used in preparations for external use, such as personal care creams and ointments.

Examples

Some examples that were formerly common in medicine include:

Tincture of benzoin Tincture of cannabis Tincture of cantharides Tincture of castoreum Tincture of ferric citrochloride, a chelate of citric acid and Iron(III) chloride Tincture of green soap, which classically contains lavender oil Tincture of guaiac gum Tincture of iodine Tincture of opium (laudanum) Camphorated tincture of opium (paregoric) Tincture of pennyroyal Warburg's tincture ("Tinctura Antiperiodica" or "Antiperiodic Tincture", a 19th-century antipyretic) Examples of spirits include:

Spirit of ammonia (spirits of hartshorn) Spirit of camphor Spirit of ether, a solution of diethyl ether in alcohol "Spirit of Mindererus", ammonium acetate in alcohol "Spirit of nitre" is not a spirit in this sense, but an old name for nitric acid (but "sweet spirit of nitre" was ethyl nitrite) Similarly "spirit(s) of salt" actually meant hydrochloric acid. The concentrated, fuming, 35% acid is still sold under this name in the UK, for use as a drain-cleaning fluid. "Spirit of vinegar" is an antiquated term for glacial acetic acid "Spirit of vitriol" is an antiquated term for sulfuric acid "Spirit of wine" or "spirits of wine" is an old term for alcohol (especially food grade alcohol derived from the distillation of wine) "Spirit of wood" referred to methanol, often derived from the destructive distillation of wood

See also Nalewka, traditional Polish category of alcoholic tincture. Infusion, water or oil based extract with similar historical uses to a tincture. Elixir, pharmaceutical preparation containing an active ingredient that is dissolved in a solution containing some percentage of ethyl alcohol. Extract Klosterfrau Melissengeist Spagyric, fermentation, distillation, and extraction of mineral components from the ash residue of calcinated plants. Topical, categorization of topical skin preparation options Theriac

References

Illustrations

Tincture: A tincture prepared from white willow bark and ethanol, containing salicin (from which salicylic acid-based products like aspirin are derived) — A tincture prepared from white willow bark and ethanol, containing salicin (from which salicylic acid-based products like aspirin are derived)

Worked examples

Example 1 — a first encounter with Tincture

Start with the simplest possible case. Write down what Tincture 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 Tincture 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 Tincture 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 Tincture

In research: Tincture 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 Tincture 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: Tincture is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dosage forms, Drug delivery devices, Polysubstance alcoholic drinks, so understanding it makes those chapters shorter.
In everyday life: Look for Tincture 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Tincture in 20 minutes

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

Frequently asked questions

What is Tincture in simple terms?

A tincture is typically an extract of plant or animal material dissolved in ethanol (ethyl alcohol). Solvent concentrations of 25–60% are common, but may run as high as 90%.

Why does Tincture 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 Tincture?

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 Tincture.