Changes

=== Yantras ===

=== Yantras ===

Many Rasashastra texts carefully spell out the layout of the laboratory, with four doors, an esoteric symbol (RASALINGA) in the east, furnaces in the southeast, instruments in the northwest, etc.  

Many Rasashastra texts carefully spell out the layout of the laboratory, with four doors, an esoteric symbol (RASALINGA) in the east, furnaces in the southeast, instruments in the northwest, etc.

== Traditional Chemical Practices in India ==

== Traditional Chemical Practices in India ==

# Ayurvedic Preparations: medical preparations including purificatory processes of mercurial compounds involved chemical reactions and apparatuses are discussed in [[Rasashastra (रसशास्त्रम्)|Rasashastra]] and [[Rasayana (रसायनम्)|Rasayana]].

# Ayurvedic Preparations: medical preparations including purificatory processes of mercurial compounds involved chemical reactions and apparatuses are discussed in [[Rasashastra (रसशास्त्रम्)|Rasashastra]] and [[Rasayana (रसायनम्)|Rasayana]].

# Chemical arts and crafts: they include the following

# Chemical arts and crafts: they include the following

## Pottery: Involves prolonged heating, fusion, evaporation, and treatment of minerals and pigments.

## '''Pottery''': Involves prolonged heating, fusion, evaporation, and treatment of minerals and pigments for coloring and art.

## Bead and Glass making: Glass is a solid fused mixture of lime, alkali, sand and metallic oxides. They were coloured by adding colouring agents like metal oxides. The Ramayana, Kautilya's Arthashastra, Brihatsamhita mention glass being used. Evidences of glass slag and glazing are found in Hastinapur, Takshila, Nevasa Kolhapur, Maheshwar and Paunar.<ref name=":0" />

## '''Bead and Glass making''': Glass is a solid fused mixture of lime, alkali, sand and metallic oxides. They were coloured by adding colouring agents like metal oxides. The Ramayana, Kautilya's Arthashastra, Brihatsamhita mention glass being used. Evidences of glass slag and glazing are found in Hastinapur, Takshila, Nevasa Kolhapur, Maheshwar and Paunar.<ref name=":0" />

## Jewellery making

## '''Jewellery making'''

## Dyeing: Numerous dyes from vegetable and mineral sources, use of mordants for textiles, craft paints which are relevant both in [[Textile Technology (तन्तुकार्यम्)|textile industry]] and [[Chitrakarma (चित्रकर्म)|chitrakarma]] or art of painting.

## '''Dyeing''': Numerous dyes from vegetable and mineral sources, use of mordants for textiles, craft paints which are relevant both in [[Textile Technology (तन्तुकार्यम्)|textile industry]] and [[Chitrakarma (चित्रकर्म)|chitrakarma]] or art of painting. The principal dyeing materials were turmeric madder, sunflower orpiment, cochineal, lac and kermes. Some other substance having tinting properties were Kampillaka, Pattanga and Jatuka. [[Chemistry of Dyeing (रञ्जनम्)|Chemistry of dyeing]] was well developed with the identification of acidic and basic natures of dyes and use of mordants especially for textiles.<ref name=":0" />

## Cosmetics and perfumes:  

## '''Cosmetics and perfumes''': Brhatsamhita mentions a large number of references to cosmetics and perfumes used in worship and for human enjoyment. The Bower Manuscript (Navanitaka) contained recipes of hair dyes which consisted of a number of plants like indigo and minerals like iron powder, black iron or steel and acidic extracts of sour rice gruel. Gandhayukti gave recipes for making scents, mouth perfumes, bath powders, incense and talcum powder.<ref name=":0" />

## Paper and soap industry:  

## '''Paper and Ink industry''': In ancient India knowledge spread verbally through the word of mouth from the teacher to the disciple, hence it was called Shruti. But with the discovery of scripts, written records gradually replaced the verbal transmission of thought.<ref>Tiwari, L. (n.d.). ''History of paper technology in India''.</ref> Paper, as a writing material, was hardly known in India before the 11th century AD. Al-Biruni writes, "it was in China that paper was first manufactured, Chinese prisoners introduced the fabrication of paper in Samarkand, and thereupon it was made in various places, so as to meet the existing want".

## Fermentation technology: Approximately 610 Mantras of ninth Maṇḍala of Ṛgveda says that they were preparing drinks like Soma (Ṛgveda-1.116.7& 10.119.3) by the process of fermentation and the same was used in several religions ceremonies and social gatherings.<ref name=":6" /> Barks of plants, stem, flower, leaves, woods, cereals, fruits and sugarcane were some of the sources for making these liquors.<ref name=":0" />

## '''Fermentation technology''': Approximately 610 Mantras of ninth Maṇḍala of Ṛgveda says that they were preparing drinks like Soma (Ṛgveda-1.116.7& 10.119.3) by the process of fermentation and the same was used in several religions ceremonies and social gatherings.<ref name=":6" /> Barks of plants, stem, flower, leaves, woods, cereals, fruits and sugarcane were some of the sources for making these liquors.<ref name=":0" />

## Building materials: Mortar and Cement using limestone, gypsum and their modified forms

## '''Building materials''': Mortar and Cement using limestone, gypsum and their modified forms

## Tanning of leather

## '''Tanning of leather:'''

# [[Mineralogy (धातुशास्त्रम्)]] or the study of Minerals, broadly involves mining of metal ores such as those of gold, silver, copper, lead, tin, zinc and iron and preparation of alloys such as bronze, and brass. A very comprehensive account of ores, minerals and metals with their extraction and working, their alloys is found in the Arthashastra. There was wide usage of metals for ornaments, utensils, warfare weaponry, coinage, and preparation of medicines.  

# [[Mineralogy (धातुशास्त्रम्)]] or the study of Minerals, broadly involves mining of metal ores such as those of gold, silver, copper, lead, tin, zinc and iron and preparation of alloys such as bronze, and brass. A very comprehensive account of ores, minerals and metals with their extraction and working, their alloys is found in the Arthashastra. There was wide usage of metals for ornaments, utensils, warfare weaponry, coinage, and preparation of medicines.  

== Chemical Arts and Crafts ==

== Chemical Arts and Crafts ==

=== Dyes and Paints ===

=== Dyes, Mordants and Pigments ===

==== Pottery - Preparation and Painting ====

Archeological and literary evidences prove that the art of dyeing was practiced since early days of Indian civilization. A dye is a colored substance which imparts more or less permanent color to other materials. Colored substances usually organic chemical compounds were used for textile dyeing. Dyes which are prepared in the form of powder, paste or solution are utilized generally in coloring cotton, wool, silk and cloth of natural fibres, in cosmetics and manufacture of ink etc. Many soluble dyes are converted into pigments by forming insoluble salts (ex - by replacing sodium in a dye salt with calcium) for use in lacquers, paints etc. Dyes were also used for artificial coloring of food items and soft drinks. They are also used for coloring hair, fur, metals etc.

People in very ancient settlements were well-acquainted with the art of making potteries of burnt clay and painting various designs on them. A large variety of ochres, haematites, pigments and organic colours were used by potters for painting the pots. This art of using pigments for beautification of pottery led to the development of paint technology in India.

Archaeological evidences of pre-historic settlements unearthed in various parts of India have revealed a large number of earthen ware items implying that the inhabitants of these early settlements were well-acquainted with the techniques related to pottery making, dye preparation and painting. It is interesting to note that regarding the pre-historic cultures, archaeologists have given a broad classification as Buff-ware culture and Red-ware culture based on the colours of the potteries distinctively found in those settlements. Potters' wheel was the characteristic implement of the Indus valley civilization.<ref name=":12">Krishnamurthy. Radha, (1997) ''History of Technology in India, Vol. 1, From Antiquity to c. 1200 A.D.'' New Delhi: Indian National Science Academy. (Chapter Dyes, Mordants and Pigments: Pages 309 - 312)</ref>

 

Manufacture of glass and coloured glass is well documented in ancient literature such as Ramayana (2.90.27), Mahabharata and ancient poetic works even though no glass objects have been recovered from Indus valley areas. Kautilya in his Arthashastra while laying down rules for the Superintendent of the treasury talks about the identification of various kinds of gems and precious stones and mentions a few times about glass; in the context of testing gems to place them in jewelry, in trade and tax payments, robbery and fines.<ref>Krishnamurthy. Radha, (1997) ''History of Technology in India, Vol. 1, From Antiquity to c. 1200 A.D.'' New Delhi: Indian National Science Academy. (Chapter Dyes, Mordants and Pigments: Page 300 - 312)</ref>

The characteristic ‘red and black’ pottery of Harappan civilization and a few polychrome potteries that have also been unearthed in these sites are painted in green and red on a buff slip. Chemical analysis revealed that red or Solomon colours in these objects are due to the presence of iron components in the clay. The slip of bright red colour is due to ferric oxide. The black and chocolate designs that are found painted on the body of the pottery owe their colour to oxides of manganese. The colouring agents used by the Indus valley people are used even today by potters. Many of the ancient techniques of selecting and applying colouring materials have come down to the present time also.<ref name=":12" />

 

* क्षेपणः काच-अर्पण-आदीनि ।। ०२.१३.३८ ।। (Arth. Shas. 2.13.38)<ref>Arthashastra ([https://sa.wikisource.org/wiki/%E0%A4%85%E0%A4%B0%E0%A5%8D%E0%A4%A5%E0%A4%B6%E0%A4%BE%E0%A4%B8%E0%A5%8D%E0%A4%A4%E0%A5%8D%E0%A4%B0%E0%A4%AE%E0%A5%8D/%E0%A4%85%E0%A4%A7%E0%A4%BF%E0%A4%95%E0%A4%B0%E0%A4%A3%E0%A4%AE%E0%A5%8D_%E0%A5%A8/%E0%A4%85%E0%A4%A7%E0%A Adhikarana 2 Adhyaya 13])</ref> Kshepana, guna, and kshudra are three kinds of ornamental work. Setting jewels (kácha, glass bead) in gold is termed kshepana.<ref>Shamasastry. R, ''Kautilya's Arthashastra with English Translation'' (Page 120)</ref>

Glass (kacha) was differentiated from crystal (sphatika) as early as in the days of Susruta (Chap. 46). Archaeological evidences support the use of glass beads, bangles, jars, tiles etc. made from 6th or 5th century' B.C. onwards. Most of the glass objects were colored. Glass manufacture practiced as an indigenous industry in ancient India is seen in excavations particularly in the south (Arikamedu, Uraiyur). Along with this, the technique of coloring glass also developed. The glass specimens show that the glass makers of ancient India were highly competent in giving different colors and shades to glass objects. In the drama Vasavadatta (6th ceutury A.D.) mention has been made of glass colored like the neck of peacock.<ref name=":1" />  

It is important to note that knowledge of colors and causal components were well known to the people. It is significant that the colors of these slips neither vanish nor fade in firing.

Foreign travel accounts like Pliny’s Naturalis Historia (73—77 AD; translated by Bostock and Riley as The Natura1 History of Pliny in 1890), Periplus Maris Erythraei (considered to be earlier than Naturalis Historia; translated by Schoff as Periplus of the Erythrean Sea in 1912) and Geography of Strabo (17—23 AD; translated by Jones and cited in Majumdar 1960: 279, 394) considered Indian glass to be of high quality as it was made of pounded quartz rather than silica. It has long been suggested that this may have been the reason behind the high silica content in ancient Indian glass according to Alok Kumar.  

* Dark pink - addition of red ochre in clay or as a slip directly

* Yellow - addition of yellow ochre

Black and chocolate shades - manganiferous hematite was used (in combination if manganese is more produces pure back color, if iron preponderates it gives a chocolate color)

 

The technique of painting pots before firing and also painting designs on them after firing was in vogue. Mostly organic colours were used to paint the surfaces. For white pigment, lime, limestone, chalk and rice powder were used. To prepare black pigment, burnt coconut shell powder, soot, powdered charcoal, black iron oxide etc. were found to be used in some other settlements.<ref name=":12" />

 

* Orange pigments were obtained by mixing red and yellow colours

It is evident that methods like filtration, decantation, making pastes by rubbing on granite with little water, boiling with ingredients like calcium, catechu, soda etc, plant identification and collection of barks and leaves, and fermentation using rice starch were the adopted chemical processing techniques in preparation of pigments.<ref name=":12" />

 

Manufacture of glass and coloured glass is well documented in ancient literature such as Ramayana (2.90.27), Mahabharata and ancient poetic works even though no glass objects have been recovered from Indus valley areas. Kautilya in his Arthashastra while laying down rules for the Superintendent of the treasury talks about the identification of various kinds of gems and precious stones and mentions a few times about glass; in the context of testing gems to place them in jewelry, in trade and tax payments, robbery and fines.<ref>Krishnamurthy. Radha, (1997) ''History of Technology in India, Vol. 1, From Antiquity to c. 1200 A.D.'' New Delhi: Indian National Science Academy. (Chapter Dyes, Mordants and Pigments: Page 312)</ref>

* शेषाः काच-मणयः ।। ०२.११.३६ ।। (Arth. Shas. 2.11.36)<ref>Arthashastra ([https://sa.wikisource.org/wiki/%E0%A4%85%E0%A4%B0%E0%A5%8D%E0%A4%A5%E0%A4%B6%E0%A4%BE%E0%A4%B8%E0%A5%8D%E0%A4%A4%E0%A5%8D%E0%A4%B0%E0%A4%AE%E0%A5%8D/%E0%A4%85%E0%A4%A7%E0%A4%BF%E0%A4%95%E0%A4%B0%E0%A4%A3%E0%A4%AE%E0%A5%8D_%E0%A5%A8/%E0%A4%85%E0%A4%A7%E0%A Adhikarana 2 Adhyaya 11])</ref> rest are the glass gems.

* क्षेपणः काच-अर्पण-आदीनि ।। ०२.१३.३८ ।। (Arth. Shas. 2.13.38)<ref>Arthashastra ([https://sa.wikisource.org/wiki/%E0%A4%85%E0%A4%B0%E0%A5%8D%E0%A4%A5%E0%A4%B6%E0%A4%BE%E0%A4%B8%E0%A5%8D%E0%A4%A4%E0%A5%8D%E0%A4%B0%E0%A4%AE%E0%A5%8D/%E0%A4%85%E0%A4%A7%E0%A4%BF%E0%A4%95%E0%A4%B0%E0%A4%A3%E0%A4%AE%E0%A5%8D_%E0%A5%A8/%E0%A4%85%E0%A4%A7%E0%A Adhikarana 2 Adhyaya 13])</ref> Kshepana, guna, and kshudra ate three kinds of ornamental work. Setting jewels (kácha, glass bead) in gold is termed kshepana.<ref>Shamasastry. R, ''Kautilya's Arthashastra with English Translation'' (Page 120)</ref>

Glass (kacha) was differentiated from crystal (sphatika) as early as in the days of Susruta (Chap. 46). Archaeological evidences support the use of glass beads, bangles, jars, tiles etc. made from 6th or 5th century' B.C. onwards. Most of the glass objects were coloured. Glass manufacture practiced as an indigenous industry in ancient India is seen in excavations particularly in the south (Arikamedu, Uraiyur). Along with this, the technique of colouring glass also developed. The glass specimens show that the glass makers of ancient India were highly competent in giving different colours and shades to glass objects.  

Chemical analysis revealed, just like in the case of pottery, that colouring agents were obtained from the metallic ores. Different chemicals added to them finally led to attribute different shades of colours and glazes to the glass objects. Coloured glass was prepared by mixing silicates of soda, lime and appropriate metallic oxides<ref>Jaggi, O.P. (1977) ''Science and Technology in Ancient India, New Delhi. Vol I'', p.203</ref>. Copper oxide, iron oxide, manganese oxides were generally used to give colours to the glass articles as for pottery. A special type of glass beads of 350 A.D. to 750 A.D. found at Ahicchatra is of gold foil glass. Layers of gold foils were poured in between two glass layers. All these prove that craftsmen in ancient India were highly skillful in the sophisticated technique of using metallic ores and chemicals as pigments in colouring very high temperature melting media like glass.

Chemical analysis revealed, just like in the case of pottery, that coloring agents were obtained from the metallic ores. Different chemicals added to them finally led to attribute different shades of colors and glazes to the glass objects. Colored glass was prepared by mixing silicates of soda, lime and appropriate metallic oxides.<ref>Jaggi, O.P. (1977) ''Science and Technology in Ancient India, New Delhi. Vol I'', p.203</ref> Copper oxide, iron oxide, manganese oxides were generally used to give colors to the glass articles as for pottery. A special type of glass beads of 350 A.D. to 750 A.D. found at Ahicchatra is of gold foil glass. Layers of gold foils were poured in between two glass layers. All these prove that craftsmen in ancient India were highly skillful in the sophisticated technique of using metallic ores and chemicals as pigments in coloring very high temperature melting media like glass.

== Chemistry in Minerals and Metals ==

== Chemistry in Minerals and Metals ==

== Fermentation Technology ==

== Fermentation Technology ==

Fermentation is a particular method of digesting of relected substances that leads to chemical transformation of organic substances into simpler compounds by the action of fement.<ref name=":7">Mira Roy. (1997) ''History of Technology in India, Vol. 1, From Antiquity to c. 1200 A.D. by A. K. Bag.'' New Delhi: Indian National Science Academy. (Chapter Fermentation Technology : Page 437)</ref>

Fermentation is a particular method of digesting of selected substances that leads to chemical transformation of organic substances into simpler compounds by the action of fement.<ref name=":7">Mira Roy. (1997) ''History of Technology in India, Vol. 1, From Antiquity to c. 1200 A.D. by A. K. Bag.'' New Delhi: Indian National Science Academy. (Chapter Fermentation Technology : Page 437)</ref>

Generally fermentation quickly sets in substances of high sugar-content. Hence fermentation technology started in different parts of the old world with sweet-substances, be it vegetable or animal product. In Egypt honey was utilized first for preparation of intoxicating drink by fermentation. In Bharat, Soma juice, a sweet substance formed the first article of fermentation by the Vedic people. Although the technique or art of fermentation has been "self generated", the process may have been observed and used in remote past.

Generally fermentation quickly sets in substances of high sugar-content. Hence fermentation technology started in different parts of the old world with sweet-substances, be it vegetable or animal product. In Egypt honey was utilized first for preparation of intoxicating drink by fermentation. In Bharat, Soma juice, a sweet substance formed the first article of fermentation by the Vedic people. Although the technique or art of fermentation has been "self generated", the process may have been observed and used in remote past.