1, make a "golden hoop", hammer the front end of the copper bar flat and slightly tilt it. Polished smooth, smeared with hot sour plum soup, covered with mercury, and dried;

2. Gold: put gold fragments into mercury and heat them to melt; Then pour it into cold water to form a thick mixture of gold and mercury-gold mud;

3. Smearing gold: Dip a "gold stick" in gold mud, then dip it in 70% concentrated nitric acid (in ancient times, it was replaced by a mixture of salt and alum) and apply it to bronze ware; Brush the gold mud evenly with a fine paint brush dipped in dilute nitric acid;

4. Opening gold: put the red-hot smokeless charcoal into a flat wire cage, and bake it around the place where the gold is coated with a metal rod to make the mercury evaporate and the gold stick to the surface of the object;

5. Calendering: Use agate or jade with 78 degrees as a press and polish it repeatedly on the gold-plated surface to make the gold-plated bright and durable.

The difference between PVD gold plating and ordinary gold plating;

1, pvd is vacuum ion plating and will fade. Compared with ordinary water content, it is more wear-resistant, but it will not fall off like the latter, but will gradually fade with the increase of wearing time. The exact time is unknown. It should be more than five years, or longer. Anyway, I haven't seen anyone who bought PVD around me, and the color fading is serious. Mainly depends on the degree of maintenance, sweating too much and being close to chemicals will affect the service life.

2. There is no waste water discharge, which is absolutely environment-friendly, and compared with gold plating with the same thickness, the wear resistance is more than 5 times that of gold plating. Generally, after titanium plating, the surface will be covered with a golden protective film, which looks like gold, beautiful and environmentally friendly.

3. The principle of ancient gold plating: gold is melted in mercury to form gold mud, which is coated on the surface of copper or silverware. When heated, mercury evaporates and gold adheres to the surface of the appliance, which is called gold plating, and it is called "fire gold plating" in modern times. This is one of the most exquisite metal craft decoration techniques in ancient times. This technology appeared in the Spring and Autumn Period and the Warring States Period, with a history of more than 2,000 years.

Extended data:

Maintenance of gold-plated watches:

1, wear a gold-plated watch, avoid contact with chemicals and waste gas, such as gas, liquefied gas and sulfur soap, and always keep the gold-plated watch dry and clean. It is best to wipe it with a flannel once a week.

2. In addition, chloride in sweat is very corrosive to gold-plated watches. When the gold-plated watch is stained with sweat, it should be wiped clean in time to prevent the watch from losing its original luster due to sweat erosion.

References:

Baidu encyclopedia-gilded