Metals are one of the most widely used materials in industry, manufacturing and fashion in general. Some of them are found in abundance in nature and demonstrate great strength and good performance, even at the most varied temperatures and pressures. However, in many cases, metals are not used purely, that is, in the way they are extracted, they need to undergo some treatments. These treatments are made to make the characteristics of the metals suitable for the design. One of the main treatments is the bath, which consists of submerging the metal into some fluid with the aim of making it acquire certain characteristic. The main baths are: - Copper bath: is one of the best known procedures in the market. As much as this material is known for its excellent performance as electric conductor, it also has as trademark the reddish color, which makes it a very sought-after product. In addition, the copper bath improves the resistance of metal. - Chromium bath: chromium is a metal with curious characteristics, because as much as its molecular structure should make it behave like iron ? and, consequently, it was not resistant to corrosion -, in practice, it behaves differently. In general, it reacts superficially with oxidizing elements. Because of this, chrome bath is a popular feature for improvement of metal resistance. - Electroplating: it uses electrolysis to cause a metal to be covered by another, usually aiming to make it more resistant. During electroplating, the metal is exposed to a cathode and an anode, aiming to affect the way its electrons circulate. Thus occurs a molecular-level phenomenon that allows the junction of metals, making it an object covered by nickel, for example. - Gold bath: in it a brass piece is submerged in another and in several other chemicals, making it become more noble. In the fashion market, this makes the accessory more valued and can be sold for a higher value. Another advantage is that gold-plated parts become more accessible, as allergic people usually have no problems using gold-plated objects.