Difference between zinc white and titanium white
Zinc white vs titanium white:
Basically we see the colour white everywhere. White colour in light is formed in collaboration with all three basic colours. Shifting directly to metals, we can see that Zinc white and titanium white have no difference between each other. But the truth is that they do differ. Zinc white and titanium white are both variations of white paint colours. And these two are the most widely used type of white pigments. These colours are mostly used by painters and artists not just in oil paintings but also in other mediums. Therefore, this paper will discuss about what actually these variations of white are and how zinc white differ from titanium white.
What is zinc white?
Zinc white is technically known as zinc oxide and it is also called as Chinese white. It also is an inorganic compound. Chemical formula of zinc oxide is ZnO. This zinc oxide is a white insoluble powder used as a pigment in paints, cosmetics, glass, and printing inks. It is an antiseptic and astringent and is used in making zinc ointment. This white powder is insoluble in water but it is soluble in (degraded by) most acids, such as hydrochloric acid. Zinc white is widely used as an additive in numerous materials and products including plastics, ceramics, glass, cement, lubricants, paints, ointments, adhesives, sealants, pigments, foods (source of Zn nutrient), batteries, ferrites, fire retardants, and first aid tapes. It occurs naturally as the mineral zincite but most zinc oxide is produced synthetically.
When talking about the chemical properties of zinc white, it is thermo chromic, changing from white to yellow when heated and in air reverting to white on cooling. About 50 per cent of Zinc white use is in the rubber industry. Zinc oxide along with stearic acid is used in the vulcanization of rubberZnO additive also protect rubber from fungi and UV light. Addition of ZnO improves the processing time and the resistance of concrete against water and therefore, zinc white is widely used for concrete manufacturing. Zinc oxide is added to many food products, including breakfast cereals, as a source of zinc, a necessary nutrient.
What is titanium white?
Titanium white is a highly durable, all-purpose white paint, favoured for its opacity, brilliant whiteness and brightness. It is a non-toxic, chemically stable substance made from the minerals anatase and rutile. The primary pigment used in titanium white is titanium dioxide, which, in its pure form, reflects 97.2 per cent of all available light. Titanium dioxide is used in numerous applications both industrial and artistic. Thus it is used to “colour” an endless line of products. It is found in correction fluid, toothpaste, road-marking paints, white fireworks, coatings, plastics, inks, sunblock and tattoo pigments. The pigment which makes titanium white, titanium dioxide, was first discovered in 1821, although the modern technology needed to mass produce it was not available until 1916. In 1921, an American manufacturer first introduced a titanium white oil paint that was suitable for artistic use. It is less prone to yellowing than other white pigments. Artists favour it because it is good for direct painting, rather than tinting.
What is the difference between titanium white and zinc white?
Firstly zinc white has lead in it and is more hazardous to use than titanium. Another main difference between the two whites is that the titanium white is much stiffer and more opaque, where zinc white is much more smoother, but it’s weaker(won’t brighten the colours as easily) and a little bit more transparent than titanium. Unless titanium white is mixed with the correct pigments, it leaves a spongy film once dry. For this reason, titanium white (titanium dioxide) and zinc white (zinc oxide) are often blended to achieve a better finish. This mixture is often called titanium-zinc white. Titanium white is intended for under painting while zinc white is used for over painting or glazes. This is determined by the oil absorption and opacity of these pigments. The particles of Zinc White are very fine, because it is usually derived from smoke fumes. It can be difficult to observe Zinc White particles without using equipment with a high magnification capability. It readily dissolves in alkaline solutions, acids and ammonia, without foaming. Titanium White is more crystalline in structure. This is especially true for two of its most popular forms rutile and anatese.
Zinc White has a boiling point of 2360 C, whereas Titanium White has a boiling point of 2972 C. The melting point of Zinc White is at 1975 C, and for Titanium White, the melting point is at 1843 C. Zinc White is soluble in water at the ratio of 0.16 mg to 100 ml (at 30 Â°C). Titanium White is relatively insoluble in water compared to Zinc White, at 7.4 x 105 M.
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