Cinnabar, also known as vermillion, is a bright red pigment made of the Cinnabar mineral which is chemically a mercury sulphide compound. Cinnabar (HgS), main ore of mercury is crushed and ground to powder which serves directly as a pigment. The ore is found in Central India. 1.2.1.1.1.2 Red Ochre (Geru) Red Ochre (Geru in Hindi) is a pigment abundantly used in Indian paintings. Its deposits are found in almost all parts of India. The colour of red ochre is not as bright as that of Cinnabar but it is found in several hues. Its use in India since very early times as can be seen from the fact that red-ochre is also known as Indian red. There are both anhydrous (Fe2O3) and hydrous (Fe2O3.nH2O) forms of red ochre. The anhydrous oxide is red while …show more content…
Chemically it is copper carbonate and is found associated with copper ore. To prepare the pigment, the stone is carefully selected, ground and sieved. Copper ore occurs in Singhbhum and Chhota Nagpur in Jharkhand, Nellore and Krishna district in Andhra Pradesh, Khetri in Rajasthan, in outer Himalayas, Kumaon, Sikkim (India), and Nepal. The copper ores by surface alterations change into Malachite, Azurite etc. 1.2.1.1.3.3 Vedgiris Vedgiris was a common pigment used in Mughal paintings and later in miniature paintings. It has also been used on textiles. It is prepared by the action of vinegar on copper foils. In composition, it is the normal acetate of copper. The pigment obtained is very bright and deep green. However, it has a disadvantage that it chars the paper or textile if not used carefully. 1.2.1.1.4 Blue pigments 1.2.1.1.4.1 Ultramarine Blue Ultramarine blue (Lajward in Hindi) is obtained from the mineral lapis lazuli, which is semi-precious stone. It has been used in miniature paintings in India. Lapis lazuli was imported to India from …show more content…
In India, charcoal prepared from the twigs and woods of tamarind tree after burning in a closed pot, is powdered to make black pigment. Some other substances which after charring were used for preparing black pigment are the shells of almonds and coconuts. The charcoal so produced is soft and gives homogeneous and fine black pigment. 1.2.1.1.6.2 Lamp Black By far, the most important black used India is ‘Kajal’ prepared by burning oil in a lamp and depositing the soot on an earthen bowl. 1.2.1.1.6.3 Ivory Black Ivory black is prepared by charring ivory cuttings in a closed earthen pot and then grinding, washing and drying black residue. The black so prepared is very intense. It is not favoured now for ecological and animal rights considerations. 1.2.1.1.6.4 Bone Black Bone black is prepared by charring animal bones in closed earthen pots. It is not as intense as ivory black but used as a substitute. 1.2.1.1.6.5 Graphite Powdered graphite, a mineral found in different parts of India, has been used as a writing material. It gives a dull grey pigment. However, it has mostly been used for drawing rather than for painting. Graphite deposits are known to occur in Bihar, Kerala, Orissa, Rajasthan and
A Purple Barium Copper Silicate Pigment from Early China. Studies in Conservation. Volume 37, No. 3 (pp. 145-154)
PURPOSE: The purpose of the experiment is to determine the specific types of pigments found in water-soluble marker pens by using paper chromatography and water as a solvent.
Observations: Once the magnesium was in the crucible and was being heated by the Bunsen burner, it glowed for a brief time. It then caught fire before the lid was placed on top. When it came into contact with the oxygen, the magnesium started glowing extremely bright, and intensely white. The glow became orange after some time. The magnesium ribbon then turned white.
The glaze coating could be a variety of colors, depending on the minerals used. Turquoise was the most common color.
The materials of black tattoo pigments are Iron Oxide (Fe3O4), Iron Oxide (FeO), Carbon, and logwood. The black pigment is made from magnetite crystals, powdered jet, wustite, bone black and amorphous carbon from combustion. Logwood is a heartwood extract found in Central America.
In the essay from Pencils to Pixels, Dennis Baron details the world’s journey from the use and making of the pencil to the computer. Barron states that the pencil wasn’t originally intended to be used as a writing device. There’s a bit of information you probably hadn’t heard before. Yes, pencils were actually adopted as a tool by “note takers.. ..scientists...and others who need to write”. They were taken from artists and adapted it for use as a writing tool ( Dennis Barron 44).
If you look closely, you can see the scrapings of lines made from the tool used to sculpt the stone. In addition, if you look close, you can see that at one time this sculpture was completely covered vibrant colors. At first, I was not aware of what polychrome or gilding was, but apparently, it is in reference to the color or painting of a piece and the technique used. I only realized this while looking under the soldier's clothing. This tells me that the soldiers were dressed in blue uniforms. The reason for the loss of color of the sculpture is unknown to me, but I could figure that since it was created in the thirteenth century, that time has taken its toll, or maybe at one point someone had stripped it of its color.
Another example of when we see the color black used is when young Lucius kills the fly at the dinner scene (1:32:00). He is initially r...
Using the spectrophotometer, the absorption of each sample was measured by scanning the wavelengths. After calibrating the spectrophotometer with the blank test tube, each sample was placed into the spectrophotometer and read at 360nm. Observations were continued for each pigment sample increasing the wavelength by 20nm increments. Once these absorbance values were recorded, absorption spectra for each pigment were graphed.
Modern technology has made the phrase “every color in the rainbow” old-fashioned. Chemists are making colors available that would stagger the old masters. From impossible pinks and greens to metallic and iridescent, the color choices are incredible. It would take a very generous budget to purchase all the hues available.
About 10,000 diverse species of pigments and dyes are used in industries, which show that an annual use of almost 7×105 tonnes in world. Dyes are intractable and toxic materials, they oppose biological breakdown (Souza et al., 2007).
After the film is processed and the silver is removed, what remains is called a "Dye Cloud" and as shown in the "enlarged" illustration below the clouds interaction creates a red color.
Vargas, F; & Lopez, O (2003). Natural colorants for food and nutraceutical uses. CRC Press, Boca Raton pp. 35-49, 257-277.
A Diamond is one of the two natural minerals that are produced from carbon. The other mineral is Graphite. Even though both of these minerals are produced from the same element ,carbon, they have totally different characteristics. One of the most obvious difference is that Diamond is hard and Graphite is soft. The Diamond is considered to be the most hardest substance found in nature. It scores a perfect ten in hardness. Because of its hardness a tiny Diamond is used as a cutting and drilling tool in industry. Even the Greeks called the Diamond “adamas” which means unconquerable. Diamonds also conducts heat better than any other mineral .
No name. No date. Pigment through the ages, visible and beyond. [Online] Available at: www.webexhibits.org/pigments/intro/visible.html. (20 May 2011)