The most famous chemical that dissolves gold is Aqua Regia, a highly corrosive mixture of concentrated nitric acid and hydrochloric acid (typically 1:3 ratio), which works because the combination oxidizes the gold and the chloride ions form a stable complex, allowing the gold to dissolve, unlike either acid alone. Other methods involve using cyanide salts (like sodium cyanide under alkaline conditions with oxygen), or newer, greener solvents like "salt aqua regia" (aluminum nitrate/sodium chloride) for recycling.
The only way gold could truly be destroyed is through nuclear reactions. However, there does exist a way to dissolve gold using “Aqua Regia,” which is a mix of hydrochloric and nitric acids.
Freshly prepared aqua regia is colorless, but it turns yellow, orange, or red within seconds from the formation of nitrosyl chloride and nitrogen dioxide. It was so named by alchemists because it can dissolve noble metals, such as gold and platinum, while leaving many other metals unaffected.
Fire assay is the traditional and most common method for refining gold. This process involves heating the gold in a crucible to a high temperature, causing it to melt and separate from any other metals that may be present.
Aqua regia is a highly corrosive mixture of two strong acids, hydrochloric acid and nitric acid. It is used for dissolving such noble metals as gold and platinum, for cleaning glassware and NMR tubes in laboratories, and for purifying gold.
Aqua regia is used for dissolving gold. Aqua regia is a mixture of concentrated nitric acid and concentrated hydrochloric acid in the ratio of c .
Vinegar is very destructive, so when you apply the vinegar to a fake piece of gold, the vinegar will cause the jewelry to tarnish. Gold is a non-reactive metal, so real pieces of gold will not react to vinegar.
If you're melting using a torch:
Scrap gold prices per gram vary significantly by purity (karat) and current market rates, but generally range from around $50-$80 USD for 10K/12K, $80-$110 USD for 14K, to $100-$130+ USD for 18K, with 22K and 24K being higher; you must check current spot prices and specific buyer rates for your karat to get an exact value, as these are just examples based on recent data.
A Crucible
The crucible is where you will place the gold materials for heating. Crucibles withstand extreme temperatures while the materials inside them melt down. Manufacturers often use graphite, clay, and porcelain to create these essential tools.
Dissolving Gold
Aqua regia is used to dissolve gold. Neither nitric acid or hydrochloric acid can do this alone. Nitric acid will act as the oxidizer and is used to form gold ions (Au3+). The hydrochloric acid is then used to react with the gold ions to form tetrachloroaurate(III) anions.
Understanding Gold Melt Value
The gold melt value represents the intrinsic worth of the pure gold content in your item. This is calculated based on three key factors: the weight of your gold, its purity (measured in karats), and the current spot price of gold in the market.
Peroxyd of manganese does this, and the gold dissolved in such a solution is a sub-chloride. The most useful and important vehicle for dissolving gold is aqua regia, (royal water), composed of two parts of hydrochloric (muriatic) acid, and one part of nitric (aquafortis).
It's not just chlorine that can damage your gold jewellery and diamonds; saltwater can damage them too. Salt causes erosion of soldered gold, silver or platinum elements. As a result, the precious metal may weaken meaning your jewellery could potentially break. The diamonds can also get blemished by salt.
Gold Purity and Karats
Most gold scrap comes from jewellery made with lower karats, such as 10k, 14k, or 18k. The higher the karat, the more pure gold it contains, and the higher the price you'll get. For example, 14k gold contains roughly 58.5% pure gold, while 18k gold contains 75%.
The best places to sell gold in 2025 are reputable online gold buyers like CashforGoldUSA and established local precious metals dealers, with online buyers typically offering 90-95% of spot price compared to 70-80% from local options.
The borax method is a technique of artisanal gold mining, which uses borax as a flux to purify gold concentrates. By using borax, no mercury flour is produced, hence gold recovery increases. Borax is a crystal-forming mineral that can be reduced to a powder, in this case for use as a flux.
Use an anhydrous borax product, such as Dehybor, in flux formulations or as a flux in gold assaying. Learn more about why borax is used in gold melting.
Crush rock small, mix with water, add cyanide solution (usually sodium cyanide). Gold sticks to the cyanide, makes a gold soup. Then throw in activated carbon (made from stuff like coconut shells) – that carbon soaks up the gold soup. Finally, burn the carbon to get rid of the cyanide and leave the gold.
Carefully place the gold piece into a bowl or cup of water. Genuine gold will settle to the base of the cup. If it is not real, it will rise to the top of the cup or remain motionless in the middle. Because of its high density, gold will quickly settle to the bottom of any water container.
How to Extract Gold from Rocks
Does baking soda damage gold? Baking soda can scratch gold surfaces, especially lower-karat or plated pieces like white gold. It's best to avoid using baking soda and instead use a gentle dish soap solution to prevent damage.