Vark

Key takeaways

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

Reference excerpt

Vark (also varak, varaq, waraq, or warq) is a fine filigree foil sheet of pure metal, typically silver but sometimes gold, used to decorate Indian sweets and food. The silver and gold are edible, though flavorless. Vark is made by pounding silver into sheets less than one micrometre (μm) thick, typically 0.2–0.8 μm. The silver sheets are typically packed between layers of paper for support; this paper is peeled away before use. It is fragile and breaks into smaller pieces if handled with direct skin contact. Leaf that is 0.2 μm thick tends to stick to skin if handled directly. Vark sheets are laid or rolled over some Indian sweets, confectionery, dry fruits and spices. It is also placed onto mounds of saffron rice on platters. For safety and ethical reasons, the Government of India has issued food safety and product standards guidelines for manufacturers of silver foil.

History

Etymology

Vark is sometimes spelled varaq, varq, vark, varkh, varakh, varkha, or waraq (Hindi: वरक़, Urdu: ورق Urdu pronunciation: [ʋəɾəq]). In Arabic, waraq (ورق), means a leaf, paper sheet, banknote or metal foil. This word was first borrowed into Persian and then subsequently borrowed into Hindustani.

Product

Manufacturing Vark is made by placing the pure metal dust between parchment sheets, then pounding the sheets until the metal dust molds into a foil, usually less than one micrometre (μm) thick, typically 0.2–0.8 μm. The sheets are typically packed with paper for support; this paper is peeled away before use. It generally takes 2 hours to pound the silver particles into foils. Particles were traditionally manually pounded between the layers of ox gut or cow hide. It is easier to separate the silver leaf from the animal tissue than to separate it from the paper. Due to the concerns of the vegetarian population of India, manufacturers have switched to the modern technologies that have evolved for the production of silver leaves in India, Germany, Russia and China. Modern technologies include beating over sheets of black special treated paper or polyester sheets coated with food-grade calcium powder (nicknamed "German plastic") instead of ox guts or cow hide. Old City in Hyderabad used to be the hub of traditional manual manufacturing, where it is a dying trade. Delhi is a new hub of vark manufacturing in India.

Usage as food The silver is edible, though flavourless. It is commonly used in India, Pakistan, and Bangladesh as coating on sweets, dry fruits, and in sugar balls, betel nuts, cardamom, and other spices. Estimated consumption of vark is 275 tons annually. Using edible silver and gold foils on sweets, confectionery and desserts is not unique to the Indian subcontinent; other regions such as Japan and Europe also use precious metal foils as food cover and decoration, including specialty drinks such as Goldwasser and Goldschläger.

Vegetarian ethical issues Concerns have been raised about the ethical acceptability and food safety of vark, as not all of it is pure silver, nor hygienically prepared, and the foil was until fairly recently beaten between layers of ox gut because it is easier to separate the silver leaf from animal tissue than to separate it from paper. Due to the grinding effect of the hammering, some of the animal intestine becomes part of the silver foil, which is sold in bulk. Since Jains and a considerable percentage of Hindus are vegetarian, this led to the decline in the usage of vark in sweets or suparis. Indian Airlines asked its caterers to not apply vark to the food supplied to ensure no animal intestine is present. In 2016, the government of India banned the usage of animal guts or skins in the making of vark. Consequently, the Indian market for vark has mostly converted to using the machine-based vegetarian process in the making of the silver foils. Food Safety and Standards Authority of India has issued guidelines for the silver leaf manufactures to adhere to regarding thickness, weight, purity, labeling and hygiene of the silver leaf.

Safety Gold and silver are approved food foils in the European Union, as E175 and E174 additives respectively. The independent European food-safety certification agency, TÜV Rheinland, has deemed gold leaf safe for consumption. Gold and silver leaf are also certified as kosher. These inert precious metal foils are not considered toxic to human beings nor to broader ecosystems. Large quantities of ingested bioactive silver can cause argyria, but the use of edible silver or gold as vark is not considered harmful to the body, since the metal is in an inert form (not ionic bioactive form), and the quantities involved in normal use are minuscule. One study has found that about 10% of 178 foils studied from the Lucknow (India) market were made of aluminium. Of the tested foils, 46% of the samples were found to have the desired purity requirement of 99.9% silver, whereas the rest had less than 99.9% silver. All the tested Indian foils contained on average trace levels of nickel (487 ppm), lead (301 ppm), copper (324 ppm), chromium (83 ppm), cadmium (97 ppm) and manganese (43 ppm). All of these are lower than natural anthropogenic exposures of these metals; the authors suggest there is a need to address a lack of purity standards in European Union and Indian food additive grade silver.

See also Gilding Gold leaf Metal leaf Metallic dragée Rolling paper

References

External links Media related to Vark at Wikimedia Commons

Illustrations

Worked examples

Example 1 — a first encounter with Vark

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

In research: Vark 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 Vark 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: Vark is common in secondary-school and first-year university syllabi. It links to neighbouring topics Food and drink decorations, Food ingredients, Gold, so understanding it makes those chapters shorter.
In everyday life: Look for Vark 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.

How to study Vark in 20 minutes

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

Frequently asked questions

What is Vark in simple terms?

Vark (also varak, varaq, waraq, or warq) is a fine filigree foil sheet of pure metal, typically silver but sometimes gold, used to decorate Indian sweets and food. The silver and gold are edible, though flavorless.

Why does Vark 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 Vark?

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 Vark.