Vivian Marlowe
The term proof in relation to alcohol originated in 16th-century England, when spirits were taxed based on their alcohol content. The original test for proof was a basic burn-or-no-burn test, in which a liquid that ignited was above proof, while one that did not was under proof. A liquid just alcoholic enough to maintain combustion was defined as 100 proof. Today, the term proof is commonly used to refer to how much ethanol is in an alcoholic drink, with 100 proof being equivalent to 50% alcohol by volume (ABV). In the United States, the proof number is twice the percentage of alcohol content by volume. Therefore, a 75 proof beverage contains approximately 37.5% alcohol.
| Characteristics | Values |
|---|---|
| Alcohol by volume | 37.5% |
| Twice the alcoholic strength by volume | 75 |
| Percentage of total volume at 20°C | 37.5% |
| Percentage of total volume at 20.00°C | 37.5% |
| Percentage of total volume at 60°F | 37.5% |
| Percentage of total volume at 15.5°C | 37.5% |
| Equivalent ABV | 37.5% |
| Equivalent proof in the US | 75 |
| Equivalent proof in the UK | 75 |
| Equivalent proof in the old British Imperial proof system | 43% |
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What You'll Learn
The term 'proof' dates back to 16th-century England
The term "proof" in relation to alcohol content has a long history, dating back to 16th-century England. During this time, alcohol consumption was already a significant part of daily life, with beer and ale being commonly consumed in places like Coventry, England, where the average consumption was about 17 pints per person per week.
In the 16th century, the production and distribution of spirits were still evolving, and spirit drinking was primarily for medicinal purposes. However, the term "proof" came into use as a way to tax spirits at different rates based on their alcohol content. This taxation system led to the creation of a burn-or-no-burn test to determine the alcohol level in spirits. If a spirit ignited, it was considered "above proof" and taxable, while a spirit that did not ignite was deemed "under proof." The term "proof" thus became associated with the alcohol content and quality of the spirit.
Another early testing method was the gunpowder test, where gunpowder was soaked in a spirit, and if the gunpowder could still burn, the spirit was rated "above proof." This method was less influenced by temperature than the "burn-or-no-burn" test but lacked reproducibility due to factors like gunpowder grain size and soaking time.
Over time, the understanding of alcohol content evolved, and by the end of the 17th century, England introduced tests based on specific gravity to define proof. In 1816, England established a legal standard based on specific density, defining 100 proof as a spirit with 12/13 the specific gravity of pure water at the same temperature.
Today, liquor is typically sold with labels stating its percentage of alcohol by volume, and the use of the term "proof" is mostly historical and linguistic. However, it remains a part of our language and culture, with certain liquors still commonly associated with their proof, such as Sunset Rum (169 proof) or Bacardi 151 (151 proof).
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The burn-or-no-burn test
The term "proof" in the context of alcohol dates back to 16th-century England, when spirits were taxed based on their alcohol content. The original method of testing the alcohol content was a simple burn-or-no-burn test, in which a liquid that ignited was considered "above proof", while one that did not was "under proof". A liquid that was just alcoholic enough to sustain combustion was defined as 100 proof and formed the basis for taxation.
Another method, the "gunpowder method", was introduced in England by the end of the 17th century. This method was based on specific gravity and was less influenced by temperature. The British definition of 100 proof, established in 1816, is 57.15% ABV, which takes into account the solubility of potassium nitrate in water and alcohol.
Today, the term "proof" is mostly historical and linguistic. Liquor is now sold with labels stating the percentage of alcohol by volume, as per the standards set by organisations like the International Organization of Legal Metrology (OIML). While the term "proof" is no longer necessary, it has persisted, and many people still define alcohol by its proof.
As an example of proof, consider a bottle labelled as 75% proof and 43% ABV. This bottle is using the old British Imperial proof system, which is no longer in use. In the American definition, the proof is twice the alcoholic strength by volume, so 43% ABV would be 86 proof. However, the label states 75% proof, indicating the use of the Imperial system.
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The gunpowder test
The term "proof" in the context of alcohol content originated in 16th-century England, referring to a test demonstrating the potency of an alcoholic spirit. One of the earliest methods for testing liquor's alcohol content was the "gunpowder test" or "gunpowder method". This test was conducted by mixing gunpowder with an alcoholic spirit and attempting to ignite it. If the gunpowder could still burn, the spirit was rated as "above proof" or "proofed", indicating an acceptable level of alcohol content. Conversely, if the gunpowder failed to ignite, it suggested that the spirit was watered down.
Today, the use of "proof" as a measure of alcohol content is mostly historical and linguistic. Modern liquor labels typically state the percentage of alcohol by volume, following regulations mandated by organisations like the European Union and specific countries. While the term "proof" persists in certain contexts, such as on liquor bottles or in colloquial discussions, it is no longer the primary method for conveying alcohol content.
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The Sikes hydrometer method
The term "proof" in relation to alcohol content dates back to 16th-century England when spirits were taxed based on their alcohol content. One of the earliest methods of testing involved simply trying to ignite the liquid, and if it burned, it was considered "above proof". This test was highly dependent on temperature, and a more reproducible method was needed.
The Sikes hydrometer is used to measure the strength of spirits by providing the user with alcohol proof, strength, and percentages. It is designed to measure ethanol/water mixtures using an arbitrary Sikes scale at 51 degrees Fahrenheit. The hydrometer is immersed in the liquid, and the level of the liquid on the scale indicates the alcohol content. The device is typically made of brass and housed in a mahogany case with a silk or velvet lining.
Sikes hydrometers from the 19th century are often found in excellent condition and are sought-after by collectors. These antique hydrometers were manufactured by companies such as Thomas O'Dempsey Buss, W.R. Loftus, Negretti & Zambra, and Joseph Long, and came in beautiful wooden cases with all the necessary weights and thermometers.
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Modern labelling laws
The TTB also implements and enforces statutory and compliance provisions to ensure that alcohol products comply with federal laws and regulations during creation, labelling, and marketing. For example, bottlers and importers must obtain a certificate of label approval (COLA) from the TTB before bottling or importing alcohol for interstate commerce. The TTB's Alcohol Beverage Advertising Program actively monitors the marketplace for compliance with alcohol beverage advertising regulations and responds to specific complaints and referrals.
In the European Union (EU), the International Organization of Legal Metrology's (OIML) International Recommendation No. 22 (1973) provides the standards for measuring alcohol strength by volume and mass. Alcohol labels must express the alcohol strength by volume as a percentage of total volume at a temperature of 20°C (68°F).
While the specific percentages may vary, the general requirement for alcoholic beverages worldwide is to include the percentage of alcohol by volume on the label. This requirement is consistent with the recommendation from the International Alliance for Responsible Drinking (IARD), which provides a table detailing alcohol beverage labelling requirements across various countries.
Historically, the term "proof" in alcohol referred to a basic ""burn-or-no-burn" test originating in 16th-century England. Spirits that ignited were considered "above proof," and those that did not were labelled "under proof." Over time, different methods, such as the gunpowder test, were introduced to standardise the definition of proof. Today, the use of proof as a measure of alcohol content is mostly historical and linguistic, with liquor labels primarily stating the percentage of alcohol by volume.
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Frequently asked questions
75 proof alcohol is approximately 37.5% alcohol by volume (ABV). In the US, proof is twice the alcoholic strength by volume, so a 75 proof drink is around 37.5% ABV.
The term 'proof' is used to describe the alcohol content of a liquor. The term originated in the 16th century in England when spirits were tested with a basic "burn-or-no-burn" test. If the alcohol ignited, it was "above proof". If it did not, it was "under proof".
The proof of an alcoholic drink can be measured using a hydrometer. This device can measure the precise proof of a spirit. Another method is the gunpowder test, where gunpowder was soaked in a spirit and then set on fire. If the gunpowder ignited, the spirit was "above proof".
The ABV of alcoholic drinks varies. Beer is generally 3-12% ABV, wine tops out at around 14-16% ABV, and spirits can be as strong as 95% ABV.
