metallic luster is one of the grades of luster strength. Generally refers to reflectivity R> .25, just like the luster produced by metal polishing. At the same time, metallic luster is also a kind of mineral luster. Some sulfide and oxide minerals. Such as pyrite, galena and specularite, have metallic luster. Metallic luster minerals are opaque minerals and are rarely used as gems. Basic introduction Chinese name: metallic luster mbth: metallic luster definition: the luster reflected by the surface reflects light: strong attribute: it is an applied discipline of mineral luster: an overview of metallurgical terms, metallic luster glaze, metallic luster ink, metallic luster printing, gold and silver ink printing, anodized hot stamping, nonmetallic luster, and an overview of mineral luster refers to the ability of minerals to reflect visible light. The luster of minerals depends on their refractive index, absorption coefficient and reflectivity. The greater the reflectivity, the stronger the luster of minerals. Metallic luster is one of the grades of luster strength. Generally refers to reflectivity R> .25, just like the luster produced by metal polishing. At the same time, metallic luster is also a kind of mineral luster. Some sulfide and oxide minerals. Such as pyrite, galena and specularite, have metallic luster. Metallic luster minerals are opaque minerals and are rarely used as gems. Metallic luster refers to the luster reflected by the polished surface of the metal, and the luster presented by the smooth and smooth surface of the metal, which is highly reflective and ranks with nonmetallic luster and semi-metallic luster. Metallic luster glaze metallic luster glaze is a kind of glaze with a metallic appearance, which is widely used in the production of glazed tiles and exterior wall tiles. After a building is paved with metallic glazed products of different colors, it is very beautiful under the irradiation of sunlight and light, so it is very popular among users. Metallic luster glaze refers to a glaze with a certain composition, which is similar to a certain metal in appearance properties such as hue and luster after treatment (or firing). Such as copper metallic luster glaze similar to copper, imitation gold luster glaze similar to gold and silver metallic luster glaze similar to silver. Broadly speaking, metallic luster glaze is the surface metallization technology of ceramic products. At present, there are three main methods for surface metallization: (1) Spraying. Organic or inorganic metal solution is directly sprayed on the hot ceramic surface, and the metallized decorative layer is formed after reduction heat treatment. (2) Splash method. Direct spraying of molten metal layer on the surface of ceramic products is also called gold plating. (3) Sintering method. In a certain composition of glaze, appropriate metal oxides are added, and after a certain heat treatment, the effect similar to metallic luster is produced. In essence, this method is the real metallic glaze. Compared with each other, these three methods have their own advantages and disadvantages: the first method is expensive in raw materials and requires high technological accuracy; The second method, which requires special sputtering equipment, has a large investment and is of little significance to the mass production of building ceramics; The third method is simple. The cost is low, and no additional equipment is needed. The first and third methods are widely used at present. Metallic Gloss Ink metallic-luster ink (MH) means that the main components of pigments in ink are gold powder and silver powder. Gold powder and silver powder are metal pigments, which are commonly known as golden copper powder and silvery white aluminum powder. They are all scaly metal powders made by mechanically mixing and grinding metal particles of copper and aluminum with stearic acid, and then grading them according to the thickness (particle size) of the particles, and then polishing them. The specifications of gold powder used in banknote lithography are generally 1 mesh to 12 mesh; The specifications of silver powder are generally 4-8 mesh. Under the irradiation of visible light, the pictures and texts printed with gold powder or silver powder as pigments can present a unique metallic color, form a metallic flash effect, and increase the natural beauty of banknotes. Because this kind of ink belongs to special ink and is not sold in the market, the banknotes printed with this kind of ink have high anti-counterfeiting performance. At present, there is a "Smooth sailing" pattern on the right side of Atlantic Bank in the upper-middle position on the back of the 25 edition of MOP of Atlantic Bank. MOP 1 and MOP 2 are printed with orange-red and blue-purple ink respectively, which is integrated with their background, while MOP 1, MOP 5 and MOP 1 are printed with metallic luster ink, and MOP 1 is added. Metallic luster printing The metallic luster printing mentioned here refers to printing with gold and silver ink and hot stamping with anodized materials, so that the printing material has a shiny metallic luster. This kind of gold or silver gives people a gorgeous and rich feeling. When it is used to decorate the packaging of products, it can not only beautify the goods. It can also increase the added value of products. Gold and silver ink printing Gold and silver ink printing is characterized by the ink made of gold powder or silver powder, which has a shiny metallic luster compared with ordinary color ink. There are two situations in the practical application of gold and silver ink: the first is to mix gold powder and silver powder with binding materials and auxiliary materials before use, and use them as needed; The second is the finished gold and silver ink made by professional ink factory, which can be stored for a period of time and can be used for production at any time, and the metallic luster remains unchanged during the validity period. Gold and silver ink printing has strong adaptability, simple application, and can be used in lithography, letterpress, gravure and screen printing processes, and its production cost is not high, and its economic benefits are good. It is a process with considerable development prospects in the field of packaging printing. Gold and silver ink printing materials are mainly gold powder, silver powder, gold and silver ink binder and printing paper. Gold powder and silver powder are metal pigments, which are commonly known as golden copper powder and silvery aluminum powder. They all adopt mechanical methods to grind, classify and polish copper and aluminum metal particles together with stearic acid, etc. to make extremely fine scaly metal powder. Generally speaking, the light reflection surface with large particle size of powder is wide, and the color rendering of metallic color is strong; When the particle size of powder is small, the light reflecting surface is narrow, and the color rendering of metallic color is weak. The binder of gold and silver ink is a special ink blending oil, which is called gold blending oil or silver blending oil for short. They are made of special resin, dry vegetable oil and various organic solvents, which are refined at high temperature. The brightness of gold and silver ink printing ink layer mainly depends on the color rendering of metal powder itself, the suspension of metal powder, the diameter and shape of powder particles and other factors, as well as the influence of gold blending oil or the affinity of silver blending oil with metal powder. Therefore, in order to make gold and silver ink have good printing performance and achieve ideal daily brushing effect, it is required that gold blending oil or silver blending oil must have the following characteristics. (1) It must have enough viscosity, and basically meet the performance indexes of printing ink such as viscosity and fluidity after blending with gold and silver powder. If the viscosity of gold-blending oil or silver-blending oil is low and there is not enough tension, gold and silver powder cannot be transferred well, and often piles of ink rollers and plates will fail. ② The acid value should be low, and the chemical properties are stable. ③ It can be evenly mixed with gold and silver powder to ensure the stability and good printing performance of metal powder suspension. (4) It can improve the color performance of gold and silver powder and make the luster and coloring power of metal powder stronger, so it must be transparent. ⑤ It must have the properties of quick drying and quick fixation, and it will dry quickly when printed on paper, so as not to get dirty on the back. In general, the mixing ratio of gold blending oil or silver blending oil with gold and silver powder in relief printing is 1: 1 or 3: 2; The mixing ratio in offset lithography is about 2: 3. According to the special needs of products, suitable paper can be selected for printing, and the ideal gold and silver printing effect can be obtained. The better the smoothness of paper surface, the better the metallic luster of printed parts; Generally, coated paper and calendered white board are better, because they have high smoothness, low ink absorption, high surface strength, moderate pH value, higher reflection coefficient for light than that on paper with poor smoothness, and the printed gold and silver are particularly bright and eye-catching, which is not easy to cause the phenomena of napping, powder removal, discoloration and fading of metal powder, and the dots are clear, the layers are rich, the color is bright, and the back is not easy to get dirty, so the product quality is better. Although the surface gloss and smoothness of glass cardboard are good, it is used to print gold and silver. Printing gold and silver in a large area will cover the white brightness of the paper itself, but weaken the characteristics of glass cardboard, so it is not suitable. Anodized aluminum hot stamping Anodized aluminum hot stamping is a method that uses copper and zinc letterpress to transfer the colored aluminum foil on the hot stamping material to the printing material or article under certain temperature, time and pressure, so as to obtain exquisite patterns and characters. Electrochemical aluminum foil is the most widely used material in hot stamping and binding at present, which is suitable for hot stamping on paper, plastic, leather, artificial leather, plexiglass and other materials. Commonly used electrochemical aluminum foil consists of five layers of different materials: (1) base layer: also called basement membrane layer, which is composed of biaxially stretched polyester film or polyester fiber film and mainly supports other layers of electrochemical aluminum foil. The thickness of base layer is 12 ~ 25mm, and other layers of electrochemical aluminum foil are adhered to the base layer in turn. The film base requires high temperature resistance and tensile strength, which can not be melted due to temperature rise during hot stamping, and can act sensitively under the action of hot stamping pressure. (2) Isolation layer: also known as release layer and peeling layer, its function is to isolate the aluminized layer from the sheet base layer, so as to facilitate automatic melting and peeling off the sheet base layer during hot stamping. The isolation layer is generally made of silicone resin solution, or it can be evenly coated on the surface of the substrate with a binder with low adhesion, which is easy to separate from the substrate. (3) Dyeing layer: also known as color layer, it is the color layer of electrochemical aluminum foil. After hot stamping, it covers the surface of pictures and texts, showing the required color, and the surface is smooth and bright. Unde that action of hot stamping temperature and pressure, the dye layer and the base film are separated, so that the electrochemical aluminum foil of the pattern part can be quickly separated from the film lay and transferred to the hot stamping object. The dyeing layer consists of synthetic resin and dye, which is coated on the surface of the isolation layer and dried to form a color film. The dyed layer has film forming property, heat resistance and transparency. The various color of that dyed lay glow with the aluminum layer as a foil. If you add a yellow dye layer, it will show the color of gold and shine; Adding other colors, such as red, green and blue, makes the varieties of anodized colorful and beautiful. (4) Aluminized layer: Using the characteristics that aluminum has high reflectivity and can better reflect light, it presents a dazzling metallic luster, which makes the color of the dyed layer more brilliant, which is the effect of bronzing. The substrate coated with the isolation layer and the dyed layer is placed in the vacuum chamber of the vacuum aluminizing machine, and the aluminum wire is melted and vaporized by resistance heating to 15℃, and continuously evaporated to the surface of the dyed layer of the thin film with a surface temperature of about 8℃, and adhered to the surface of the dyed layer to form an aluminized layer with uniform thickness. Because the aluminizing process is completed under vacuum condition, it is also called vacuum aluminizing. When aluminizing, aluminum is plated by resistance heating and hot stamping, so it is called "anodized". (5) Adhesive layer: It is used to attach the aluminized layer and the dyed layer to the printing material by heating and pressurizing during hot stamping. The adhesive layer protects the anodized film during storage and transportation. The adhesive layer is mainly composed of thermoplastic resin, Cuban gum or shellac and rosin dissolved in organic solvent or prepared into water emulsion to make coating adhesive solution. Uniformly coating the prepared adhesive solution on the surface of vacuum aluminized layer by a coater, and drying to form an adhesive layer. The adhesive layer should adapt to the adhesion of paper, cloth, plastic, leather and other materials, and the coating thickness should be uniform. The colors of common electrochemical aluminum foil are gold, silver, scarlet, brownish red, blue, green, grass green, emerald green and light green. Among them, gold is the most commonly used, followed by silver. Non-metallic luster Non-metallic luster is a general term for all kinds of luster except metallic luster and semi-metallic luster. It is characterized by no metallic feeling, usually weak reflection, but some are also strong. Minerals with such luster are usually nonmetallic minerals and appear as transparent or translucent minerals. It can be further divided into: 1) Diamond luster refers to the luster reflected on the polished surfaces with diamonds and other precious stones, such as galena. 2) glass luster, like the luster reflected by the glass surface, such as the luster of calcite. 3) Pearl luster, some minerals are light-colored and transparent, and as a result of a series of parallel cleavages reflecting light many times, they show the luster as the pearl layer on the inner surface of mussel shell, such as gypsum, muscovite and so on. 4) Grease luster, also known as "fatty luster". On the fracture surface of some transparent minerals, due to the unsmooth reflective surface, some light is scattered and presents an oily luster, such as the luster on the fracture surface of Shi Ying and nepheline. 5) Resin luster, also known as "resin luster", on some yellow, brown or brown minerals, due to the uneven reflective surface, some light is scattered and presents a rosin-like luster, such as light-colored sphalerite. 6) Silk luster, in fibrous aggregate-like light-colored transparent minerals, as a result of the interaction of reflected light of various fibers, presents the luster as a bunch of silk, such as the luster of asbestos. 7) Waxy luster, the surface of some aphanitic blocks or gel minerals presents the luster shown by paraffin, such as the luster of massive pyrophyllite and serpentine. They are nephrite minerals, which can be used as seals and handicrafts. 8) Earthy luster: On the earthy aggregate of minerals, due to the loose and porous reflecting surface, almost all the light is scattered and presents a dull earthy luster, such as the luster of kaolinite earthy blocks.