How to test gold products with iodine

Instructions

Probably everyone has such a drug as iodine at home. If not, then it can easily be purchased at a pharmacy, since it does not require a doctor's prescription and is cheap. In medicine, iodine is considered an antiseptic. However, it is also used for other purposes. For example, a widely known method for testing gold is iodine, where it is used as an indicator to determine the authenticity of the metal. However, the drug will only help in recognizing gold. For other metal products it will not show the true result. So, having decided to try this method, you need to do the following.

1. They take gold jewelry. Usually, doubts arise in samples 583 and 585, since their tint may be slightly reddish, which can raise doubts. But it may also be associated with the presence of an alloy in the metal composition.
2. Then the product is lightly sanded on the inside. This is necessary for the reaction with iodine to occur. Most often, sandpaper is used for this, although you can use another abrasive.
3. After soaking a cotton swab in iodine, apply it to the gold item in the place of wear. It doesn’t matter whether a small or large amount of iodine will participate in the reaction. Therefore, you need to try to apply only a small, unnoticeable spot. The reaction will not increase depending on the size of the abrasion area, but then you will have to spend more effort to wash it, and a trace of abrasion may remain.
4. It remains to monitor the reaction. If a dark color stain appears, then the jewelry is genuine. It is precisely made of precious metal. But if the color remains the same, then the product is not gold, but bronze, copper or brass. The chemical reaction occurs because gold is able to react with halogens. And iodine is exactly that.

Don't try it on your teeth!

Gold is a soft metal, so if you squeeze it hard with your teeth, marks will appear. Agree, the seller will not like it and will force you to buy.

Athletes test their medals for the sake of photos. Moreover, gold medals are actually just gold plated.

By the way, fake aluminum behaves exactly the same way, so if the seller insists on a “teeth test”, don’t be fooled.

On the other hand, only a new product does not have even small scratches on the surface. If a person claims to be selling his used gold, but it appears to have only come from a factory, something is wrong here.

other methods

To check, you can use not only iodine, but also other substances, such as lapis pencil, vinegar, magnet. Your own hearing will also help. Many people know these methods. Therefore, if there is no iodine in the house, then it is quite possible to use them as an alternative method.

The lapis pencil contains silver nitrate, which is the active ingredient. The product is used in medicine for the purpose of cauterization. With its help, a test is done, the opposite of iodine. Gold is the only metal that will not react with a pencil. All others will change their color. However, if the product is of low quality, then the result is in question.

All you need to do is leave the decoration in the vinegar for only half a minute, during which you observe the reaction. There will be no reaction to gold. But other metals will begin to oxidize. But, if the sample turns out to be less than 750, then it is also difficult to judge the reliability, as in the previous case.

Attraction with a magnet will reveal the presence of a high iron content in the jewelry. Gold will not react to a magnet. However, at the same time, metals such as aluminum and copper are also not magnetic. Therefore, the experiment will only show the presence or absence of iron.

If a person has a good ear for music, he will be able to distinguish gold, since it is a sonorous metal. To do this, it should be thrown onto a smooth surface. Vibration should be heard, like crystal. Other metals, when hitting the surface, emit a heavy sound that is somewhat harsh on the ear. But, of course, this method cannot be called simple for the average person.

On what metal does iodine turn white - Metalist's Handbook

Ammonia.

You can try to wipe off the dirt immediately, but if the gold has darkened in hard-to-reach areas, the oxides formed on gold jewelry are silver compounds or How to clean gold from iodine? A soap solution won't help here, a dark spot from iodine...

Hydrochloric acid is possible - probably!

Wipe with ammonia

You will need pure hydrogen and something like a pressure chamber, you need the hydrogen to react with iodine and the compound will dissipate (by the way, there is a danger, it turns out to be an acid. Do not inhale). You can also heat it in soft water and wash it thoroughly! Fortunately for you, silver practically does not react with anything.

Silver ring, blackened by iodine, how to remove the stain? (sorry, wrong topic)

Apply lipstick to a regular napkin and rub the surface of the ring with this side of the napkin

Silver also darkens from iodine. If you rub a silver product with chalk, it will darken. You should also be aware that the surface of a silver ring, for example, can simply be coated with a layer of silver.

It is difficult to remove iodine from silver at home; jewelers do this. If you find a fixer for photographs, you can hold it in the solution. They write on some forums that they managed to wipe off such a stain with starch from a silver spoon.

Rub with pemoxole

Silver reducing agent

Can iodine darken silver?

No

Why does silver darken? Darkening of silver occurs with prolonged contact with the skin. Moreover, the rate of its darkening is individual in nature; on one person, silver may not darken for years, but on another it will darken in a matter of days.

How to check silver for authenticity?

Take it to another pawnshop or show it to a silver store, they’ll definitely sort it out there

Do not forget that iodine leaves dark stains on silver items. We have already noted that silver is a very soft metal, it is easy to remove jewelry, as it may darken or...

The weight is too small for the price. . maybe it's gold plated? ) Apply regular sulfur ointment from a pharmacy - the silver will turn black!! ! The blackness can be washed off. Iodine gives the same effect, but the blackness is difficult to wash off!

They also sell a “silver test” reagent or something like that..

How to test a coin for silver at home?

A fake is usually lighter, which an experienced numismatist will immediately sense. Characteristic ringing (although the Chinese have already learned to make ringing fakes)

How to clean silver? The silver earrings have darkened, nothing helps from the available advice. Is there something stronger? Fox. I cleaned everything with chalk, even without ammonia, a silver keychain measuring 3 by five spilled iodine and turned black, I just scratched it with chalk and...

How can you clean a silver chain?

Try toothpaste and a toothbrush, maybe you'll get lucky

The silver chain darkened after a quarrel - what could it be? expand. I wear a silver cross on a silver chain. So tell me, please, what was it? Is it a reaction of silver to iodine in the body or something else?

Baking soda

Try tooth powder...

I clean my silver rings with tooth powder. very helpful

Dip in ammonia!!!100 percent helps.tested by me more than once

Try toothpaste or powder (which is rare these days, however)

Silver will turn black under the influence of hydrogen sulfide, but nothing will happen to platinum. Test using iodine. Under a drop of an alcohol solution of iodine, silver also blackens, and the higher its quality, the stronger.

Buy a Straight or Coke. and leave it for half an hour. will shine like new.

Wash with Pemolux or even better, all the dishes (spoons, forks... iron) often accumulate blackness in hard-to-reach places... 2 liters of water and 0.5 cups of simple powder... any... boil for 2.3 minutes... you'll see how everything goes will shine

Take tooth powder, add some water to it until it becomes creamy and apply this mixture thickly onto the chain, leave for 6 hours, and then rinse thoroughly. If it has darkened greatly, then the exposure time should be longer. And toothpaste won't help. Good luck!

Explain the reason for the darkening of the silver chain???

Oxidation occurs in air

How to purify gold from iodine. It’s no secret that iodine is an insidious thing; this drug leaves stains on gold! But I didn’t know that the gold would darken in color, now it’s dark and there’s no way to remove it.

This means it is made of our silver, and it requires care. Jewelry shops sell special impregnated wipes and liquid. At home, you can clean with paste and ammonia solution. There is rhodium plated silver, it shines and does not turn black. And any product requires care so that it shines and has an attractive appearance.

Oxidized. Clean it with slaked soda and vinegar, it will be like new

How to lighten a silver chain?

Silit - everything that you can handle!!! By the way, iodine is discolored (from tissues) by ascorbic acid

This alloy turns dark from iodine only because of silver. If they sell you copper with a small silver content under the guise of gold, it will also darken.

How to check whether silver is real or not

By sample

Drop iodine onto the product and wait a few minutes, placing the product under the sun's rays. If the color has changed and darkened, then it is real silver. This method should be used if you do not feel sorry for the product, since the darkening caused in combination with...

If you run the silver across a white sheet, it will leave a mark; buy a lapis pencil at the pharmacy and run it over the product, the mark will disappear on the silver.

Silver or silver plated, how to tell the difference???

Silver items are marked as SILVER PLATED - no.

https://www.youtube.com/watch?v=-zO_poAblmw

Reasons for darkening of silver But if the silver does darken, it needs to be cleaned. You will be able to shine in your jewelry again, enjoy the sight of beautiful dishes and interior.

Who knows what silver is blackened with and whether it can be done at home?

I remember the chain turned black from iodine. But to specifically blacken it, I don’t know.

The only problem that owners of such jewelry have to deal with is the darkening of the silver. But if the silver has darkened, then how can you clean it in an apartment?

The niello technology consists of smelting a black alloy of silver, copper, lead and sulfur into a base metal - silver or gold - to achieve color contrast. Small indentations must be made in the base metal by engraving, chasing or etching. So it most likely won’t work at home

https://www.vologda.ru/~chern/

Do you want to artificially age her? There is no simpler recipe! pour in tea, ordinary black and stronger... leave for several hours until the desired result is achieved... but in general it’s funny... I usually wonder how to clean silver without scratching the surface with powders)))

A zatsem you eto?

How can silver be distinguished from ordinary iron?

Magit.

Silver has turned black, how to clean it using available means. Owners of silver jewelry ask themselves the same question: how to clean blackened silver? Julia on How to remove iodine from clothes and other surfaces 7 proven methods.

!!! 925 breakdown...

How to check silver for authenticity?

Stamp stamped on silver

But most often in this regard, metals such as copper, silver and palladium are used. Iodine can ruin gold items. A beautiful piece of jewelry can turn black, and the main trouble is not even that the gold has darkened, but that...

Method of purification from iodine

Having completed the iodine test, another question may then arise on how to get rid of a stain on a gold item. After all, iodine, as we found out, leaves dark spots. However, you should not worry about this, since in this case special work will not be required. But you can be sure that the jewelry is actually gold.

Over time, the stain will disappear on its own. But if it is important to erase it urgently, then you can use one of the following cleaning methods after checking the gold. Solutions using soap or powder will be useless in this case, since the substance is resistant to them. The following will help.

1. Hyposulfite can act as a cleaner. It is used to develop photos in the old way. Prepare the liquid as follows: take one tbsp. a spoonful of fixative and dilute it in a glass of water at room temperature. The gold item is kept in this solution for thirty minutes, and then washed under waste water and dried.
2. Ammonia will also help. But before using it, it is worth considering that it will not always have the desired effect. In addition, the smell will take a long time to dissipate, within 3 days.
3. You can also use the oldest method, which was known to our grandparents. To do this, take 70 g of soda, 80 g of lime and 20 g of salt. All components are mixed and dissolved in one liter of water, where the gold product is then placed for an hour and a half.

It is also worth remembering that testing gold for authenticity using iodine is only suitable when it is made of solid metal. If the product is gold-plated, the method will also indicate authenticity only if the corresponding layer is not erased. In addition, this can ruin the decoration. Therefore, it is better not to risk it and take it to the master.

Cleaning can be done at a jeweler as well as inspection. Naturally, they do all this at home for free. However, the result may be unreliable, and during the procedures there is a risk of damage to the jewelry. On the other hand, by contacting a jeweler, you can not only confirm the authenticity of the product, but also find out the sample of the existing alloy. A specialist will determine a reliable result in just a few minutes. Once upon a time, this required making cuts or cuts on the inside. However, today the inspection is carried out without compromising the integrity of the jewelry. The method consists in determining the density of gold and chemical. reactions. After checking, a specialist receives a document containing information about whether the jewelry contains gold or not.

Water test, Archimedes method

For the test you need: high-precision scales, thread, measuring cup, water (distilled will give a more accurate result), a table of the density of materials.

Density of precious metals:

To make gold jewelry, an alloy of gold and other metals is used. To indicate the percentage of gold, jewelry is marked with a hallmark. The higher the standard, the more expensive the jewelry. Also, the higher the percentage of gold content, the higher the density of the entire product.

Archimedes' method is based on these features. How to take measurements:

1. Weigh the product (m).
2. Find the volume - put a glass of water on the scale, reset the weight (the scale should read 0). We lower the product being tested into the water on a rope (without touching the walls and bottom), and record the readings (v).
3. Carry out the calculation using the formula - p = m / v.
4. The resulting density (p) is compared with the table (density of precious metals).

For clarity, check out the video on density measurement:

How to check authenticity in a store

People do not always have the opportunity to use home testing methods or take it to a jeweler. For example, you need to know exactly how to identify gold when purchasing it in a store. If a product is purchased on the territory of Russia, then it must have a sample and the letter of the person who puts the stamp on it. If this is not the case, then there is no need to talk about legal gold. Most likely it's costume jewelry. The quality of gold jewelry varies from country to country. Therefore, when it is bought in other countries, in addition to the sample, you must pay attention to other characteristics.

1. The polish should be shiny.
2. The coating and spraying are done evenly, and the color is the same.
3. If the product contains a stone, it is firmly inserted.
4. All units have their own tag made of white thick paper, in which there is a hole with a stretched thread. Here you can find information about the product: its weight, sample, manufacturer, name, legal address.

The presence of impurities can be determined visually by the color of the product. White color is formed with the help of silver and platinum, yellow - with silver and copper, red indicates that copper predominates in the alloy, green is obtained by combining silver, copper and cadmium, and a gray tint is acquired with the presence of steel. It is not recommended to purchase such a product over the Internet, as in this case there is a high risk of counterfeiting.

Visual inspection

Visual inspection boils down to checking the markings of the gold product. You need to find a sample and a distinctive sign of the manufacturer. The original product has all the details, the numbers are easy to read, and the stamping depth is the same. The size is barely readable.

At the top is a fake, at the bottom is a real gold ring.

Large numbers, the absence of a manufacturer's mark, and different depths of numbers should alert you. It is better to refuse such jewelry and not make a purchase.