KATALINAKKARE PONORAE KANA PONNINU PONOROAE
Gold- Part 3-Continuing from Part 2 16 Gold in Photography. In photography, gold toners areused to shift the colour of silver bromide black-and-white prints towards brownor blue tones, or to increase their stability. Used on sepia-toned prints, goldtoners produce red tones. Kodak published formulas for several types of goldtoners, which use gold as the chloride. Update – Photographic films arepractically not available.Manycompanies producing photographic films are now producing X-ray films. Dentalclinics also use small size x-ray films to study the tooth paining is damagedor can be treated with root canal. 95% dental doctors are not for removingtooth, unless warranted. 17. Satellites As gold is a good reflector ofelectromagnetic radiation such as infrared and visible light as well as radiowaves, it is used forthe protective coatings on many artificial satellites, in infraredprotective faceplates in thermal protection suits and astronauts' helmets andin electronic warfare planes like the EA-6B Prowler. Gold is used as the reflective layer on some high-end CDs. MY NOTE- yesterday I was seeing a news item aboutelectronic waste. If the CDs have gold surely on knowing it they would preserveit. 18. Aircraft cockpit windows Gold can be manufacture so thinthat it appears transparent. It is used in some aircraft cockpit windows for de-icing or anti-icing bypassing electricity through it. The heat produced by the resistanceof the gold is enough to deter ice from forming. 19. Electronic The concentration of freeelectrons in gold metal is 5.90×1022 cm−3. Gold is highly conductive to electricity, and has been usedfor electrical wiring in some high-energy applications Though gold is attacked by freechlorine, its good conductivity and general resistance to oxidation andcorrosion in other environments (including resistance to non-chlorinated acids)has led to its widespread industrial use in the electronic era. The use of gold in otherapplications in electronic sliding contacts in highly humid or corrosiveatmospheres, and in use for contacts with a very high failure cost (certaincomputers, communications equipment, spacecraft, and jet aircraft engines)remains very common. Some of the telecommunicationequipments had gold contacts or contacts with gold coating as Iunderstand. ON disposing by tender scrap merchants after visit used toquote very high value. 20 Commercial chemistry Gold is attacked by and dissolvesin alkaline solutions of potassium or sodium cyanide, to form the salt goldcyanide—a technique thathas been used in extracting metallic gold from ores in the cyanide process. 20a. Eini kallanmarae pedikkanda (Do not afraid of thieves) Gold cyanide is the electrolyteused in commercial electroplating of gold onto base metals and electroforming. (Members may be recollecting gold ornaments covered with one gramof gold of Kollam supreme or Kalyani covering etc.) 21. Cultural History Ancient Greek golden decoratedcrown, funerary or marriage material, 370–360 BC. Has been recovered from agrave in Armento, Campania. Gold artefacts found at the NahalKana cave cemetery dated during the 1980s, showed these to be from within theChalcolithic, and considered the earliest. Gold artefacts such as the goldenhats and the Nebra disk appeared in Central Europe from the 2nd millennium BCBronze Age. Egyptian hieroglyphs from as early as 2600 BC describe gold, which kingTushratta of the Mitanni claimed was "more plentiful than dirt" inEgypt. Egypt and especially Nubia hadthe resources to make them major gold-producing areas for much of history. Theearliest known map is known as the Turin Papyrus Map and shows the plan of agold mine in Nubia together with indications of the local geology. Theprimitive working methods are described by both Strabo and Diodorus Siculus,and included fire-setting. Large mines were also presentacross the Red Sea in what is now Saudi Arabia. To the use of fleeces to trapgold dust from placer deposits in the ancient world. Gold ismentioned frequently in the Old Testament, starting with Genesis 2:11(at Havilah), the story of The Golden Calf and many parts of the templeincluding the Menorah and the golden altar. In the New Testament, it isincluded with the gifts of the magi in the first chapters of Matthew. The Book of Revelation 21:21 describes the city of New Jerusalem ashaving streets "made of pure gold, clear as crystal". Exploitation of gold in thesouth-east corner of the Black Sea is said to date from the time of Midas, andthis gold was important in the establishment of what is probably the world's earliest coinage inLydia around 610 BC. >From the 6th or 5th century BC,the Chu (state) circulated the Ying Yuan, one >kind of square gold coin. MY NOTE- Even before reading fromWikipedia before months about the square coins, I had a dream of coins in RECTANGULAR shape on roadside just lying here and there and I am collecting. These coins weresilvery with green top and with a cutting hold at top in square!! In Roman metallurgy, new methods for extracting gold on a large scale were developedby introducing hydraulic mining methods, especially in Hispania from 25BC onwards and in Dacia from 106 AD onwards. One of their largest mines was atLas Medulas in León (Spain), where seven long aqueducts enabled them to sluicemost of a large alluvial deposit. The mines at Roşia Montană in Transylvania were also very large, anduntil very recently, still mined by opencast methods. They alsoexploited smaller deposits in Britain, such as placer and hard-rock deposits atDolaucothi. The various methods they used are well described by Pliny the Elderin his encyclopedia Naturalis Historia written towards the end of the firstcentury AD. 22. Hajj and decline of price During Mansa Musa's (ruler of theMali Empire from 1312 to 1337) hajj to Mecca in 1324, he passed through Cairo in July 1324, and wasreportedly accompanied by a camel train that included thousands of people andnearly a hundred camels where he gave away so much gold that it depressed theprice in Egypt for over a decade. A contemporary Arab historianremarked: Gold was at a high price in Egypt until they came in that year. Themithqal did not go below 25 dirhams and was generally above, butfrom that time its value fell and it cheapened in price and has remained cheaptill now. The mithqal does not exceed 22 dirhams or less. This has been thestate of affairs for ABOUT TWELVE YEARS until this day by reason of the largeamount of gold which they brought into Egypt and spent there —Chihab Al-Umari My note- Irecollect purchasing gold chain @ Rs 18-00 per gram in 1971. But my salarywas Rs 280 23. Role of gold in western culture Gold played a role in westernculture, as a cause for desire and of corruption, as told in children's fableslike Rumplestiltskin, wherethe peasant's daughter turns hay into gold, in return for giving up her childwhen she becomes a princess, and stealing the hen that lays goldeneggs in Jack and the beanstalk. 24. Maayam- marimaayam There is an age-old tradition ofbiting gold to test its authenticity. Although this is certainly not aprofessional way of examining gold, the bite test was not to check if the coin was gold (90% goldcoins are fairly strong) but to see if the coin was gold plated lead. A lead coin would be very soft and thus teeth marks would result. Fake gold coins were a commonproblem before 1932 so weighing a coin and also sliding a coin through a "counterfeit detector"slot was common (making a lead coin thicker would add weight thus why slide itthrough a measured slot). Most establishments (especially US Western saloons)would never accept a gold (or silver) coin of high value before weighing suchan item. 25. Gold treasures Golden treasures have beenrumoured to be found at various locations, following tragedies such as theJewish temple treasures in the Vatican, following the temple's destruction in70 AD, a gold stash on the Titanic, the Nazi gold train – following World WarII. The Dome of the Rock onthe Jerusalem temple site is covered with an ultra-thin golden glasure. The Sikh Golden temple, theHarmandir Sahib, is a building covered with gold. Similarly the Wat Phra Kaewemerald Budha temple in Thailand has ornamental gold statues walls and roofs. Some European king and queen's crowns were made of gold, andgold was used for the bridal crown since antiquity. An ancient Talmudic textcirca 100 AD describes Rachel, Rabbi Akiba's wife asking for a "Jerusalemof Gold" (crown). A Greek burial crown made of gold was found in a gravecirca 370 BC. 26. Nugget weighing 4.9 Kg 156-troy-ounce (4.9 kg) nugget,known as the Mojave Nugget, wasfound by an individual prospector in the Southern California Desert using ametal detector. I think the posting on Gold is interesting and informative. Most of theinformation is compilation. Reposted on 5-2-2021 after editing and updating. R. Gopala krishnan. -- You received this message because you are subscribed to the Google Groups "Thatha_Patty" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/thatha_patty/664449241.1901780.1612530038854%40mail.yahoo.com.
