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chased the casting is worked until the telltale signs of the casting process are removed so that the casting now looks like the original model pits left by air bubbles in the casting and the stubs of the spruing are filed down and polished prior to silica based casting moulds these moulds were made of a variety of other fire proof materials the most common being plaster based with added grout and clay based prior to rubber moulds gelatine was used step 1 a model of an apple in wax step 2 from the model a rubber mould is made the mould is shown here with a solid cast in plaster step 3 from this rubber mould a hollow wax or paraffin cast is made step 4 the hollow paraffin apple is covered with a final fire proof mould in this case clay based an open view the core is also filled with fire proof material note the stainless steel core supports in the next step not shown the mould is heated in an oven upside down and the wax is lost step 5 liquid bronze at 1200 c is poured into the dried and empty casting mould step 6 the bronze cast still with spruing attached the sprue will be cut away and the final shape polished jewellery and small parts edit the methods used for small parts and jewellery vary somewhat from those used for sculpture a wax model is obtained either from injection into a rubber mould or by being custom made by carving the wax or waxes are sprued and fused onto a rubber base called a sprue base then a metal flask which resembles a short length of steel pipe that ranges roughly from 3 5 to 15 centimeters 1 4 to 5 9 in tall and wide is put over the sprue base and the waxes most sprue bases have a circular rim which grips the standard sized flask holding it in place investment refractory plaster is mixed and poured into the flask filling it it hardens then is burned out as outlined above casting is usually done straight from the kiln either by centrifugal casting or vacuum casting the lost wax process can be used with any material that can burn melt or evaporate to leave a mould cavity some automobile manufacturers use a lost foam technique to make engine blocks the model is made of polystyrene foam which is placed into a casting flask consisting of a cope and drag which is then filled with casting sand the foam supports the sand allowing shapes that would be impossible if the process had to rely on the sand alone the metal is poured in vaporizing the foam with its heat in dentistry gold crowns inlays and onlays are made by the lost wax technique application of lost wax technique for the fabrication of cast inlay was first reported by taggart a typical gold alloy is about 60 gold and 28 silver with copper and other metals making up the rest careful attention to tooth preparation impression taking and laboratory technique are required to make this type of restoration a success dental laboratories make other items this way as well textiles edit in this process the wax and the textile are both replaced by the metal during the casting process whereby the fabric reinforcement allows for a thinner model and thus reduces the amount of metal expended in the mould 10 evidence of this process is seen by the textile relief on the reverse side of objects and is sometimes referred to as lost wax lost textile this textile relief is visible on gold ornaments from burial mounds in southern siberia of the ancient horse riding tribes such as the distinctive group of openwork gold plaques housed in the hermitage museum saint petersburg 10 the technique may have its origins in the far east as indicated by the few han examples and the bronze buckle and gold plaques found at the cemetery at xigou 11 such a technique may also have been used to manufacture some viking age oval brooches indicated by numerous examples with fabric imprints such as those of castletown scotland 12 glass sculptures edit lost wax cast glass sculpture purple reigns by carol milne the lost wax casting process may also be used in the production of cast glass sculptures the original sculpture is made from wax the sculpture is then covered with mold material e g plaster except for the bottom of the mold which must remain open when the mold has hardened the encased sculpture is removed by applying heat to the bottom of the mold this melts out the wax the wax is lost and destroys the original sculpture the mold is then placed in a kiln upside down with a funnel like cup on top that holds small chunks of glass when the kiln is brought up to temperature 1 450 1 530 f or 790 830 c the glass chunks melt and flow down into the mold annealing time is usually 3 5 days and total kiln time is 5 or more days after the mold is removed from the kiln the mold material is removed to reveal the sculpture inside archaeological history edit black sea edit varna necropolis grave offerings on exhibit at the varna museum cast gold knucklebones beads and bracelets found in graves at bulgaria s varna necropolis have been dated to approximately 6500 years bp they are believed to be both some of the oldest known manufactured golden objects and the oldest objects known to have been made using lost wax casting 2 middle east edit replica of a bronze sceptre from the nahal mishmar hoard some of the oldest known examples of the lost wax technique are the objects discovered in the nahal mishmar hoard in southern land of israel and which belong to the chalcolithic period 4500 3500 bc conservative carbon 14 estimates date the items to around 3700 bc making them more than 5 700 years old 4 5 near east edit in mesopotamia from c 3500 2750 bc the lost wax technique was used for small scale and then later large scale copper and bronze statues 4 one of the earliest surviving lost wax castings is a small lion pendant from uruk iv sumerian metalworkers were practicing lost wax casting from approximately c 3500 3200 bc 13 much later examples from northeastern mesopotamia anatolia include the great tumulus at gordion late 8th century bc as well as other types of urartian cauldron attachments 14 south asia edit the dancing girl of mohenjo daro 2300 1750 bc metal casting by the indus valley civilization produced some of the earliest known examples of lost wax casting applied to the casting of copper alloys a copper wheel shaped amulet found at mehrgarh pakistan has been dated at ca 4000 bce 3 a bronze figurine found at mohenjo daro and named the dancing girl is dated to 2300 1750 bc 15 16 other examples include the buffalo bull and dog found at mohenjodaro and harappa 7 16 17 two copper figures found at the harappan site lothal in the district of ahmedabad of gujarat 15 and likely a covered cart with wheels missing and a complete cart with a driver found at chanhudaro 7 17 during the post harappan period hoards of copper and bronze implements made by the lost wax process are known from tamil nadu uttar pradesh bihar madhya pradesh odisha andhra pradesh and west bengal 15 gold and copper ornaments apparently hellenistic in style made by cire perdue were found at the ruins at sirkap one example of this indo greek art dates to the 1st century bc the juvenile figure of harpocrates excavated at taxila 15 bronze icons were produced during the 3rd and 4th centuries such as the buddha image at amaravati and the images of rama and kartikeya in the guntur district of andhra pradesh 15 a further two bronze images of parsvanatha and a small hollow cast bull came from sahribahlol gandhara and a standing tirthankara 2nd 3rd century ad from chausa in bihar should be mentioned here as well 15 other notable bronze figures and images have been found in rupar mathura in uttar pradesh and brahmapura maharashtra 15 making sculpture using a lost wax process at bastar district chhattisgarh india gupta and post gupta period bronze figures have been recovered from the following sites saranath mirpur khas in pakistan sirpur district of raipur balaighat near mahasthan now in bangladesh akota near vadodara gujarat vasantagadh chhatarhi barmer and chambi in rajesthan 15 the bronze casting technique and making of bronze images of traditional icons reached a high stage of development in south india during the medieval period although bronze images were modelled and cast during the pallava period in the eighth and ninth centuries some of the most beautiful and exquisite statues were produced during the chola period in tamil nadu from the tenth to the twelfth century the technique and art of fashioning bronze images is still skillfully practised in south india particularly in kumbakonam the distinguished patron during the tenth century was the widowed chola queen sembiyan maha devi chola bronzes are the most sought after collector s items by art lovers all over the world the technique was used throughout india as well as in the neighbouring countries nepal tibet ceylon burma and siam 16 southeast asia edit wax forms for casting bronze statues for a tibetan monastery near kullu himachal pradesh india the inhabitants of ban na di were casting bronze from c 1200 bc to 200 ad using the lost wax technique to manufacture bangles 18 bangles made by the lost wax process are characteristic of northeast thailand 19 some of the bangles from ban na di revealed a dark grey substance between the central clay core and the metal which on analysis was identified as an unrefined form of insect wax 19 18 it is likely that decorative items like bracelets and rings were made by cire perdue at non nok tha and ban chiang 7 there are technological and material parallels between northeast thailand and vietnam concerning the lost wax technique 7 the sites exhibiting artifacts made by the lost mould process in vietnam such as the dong son drums come from the dong son and phung nguyen cultures 7 such as one sickle and the figure of a seated individual from go mun near phung nguyen the bac bo region dating to the go mun phase end of the general b period up until the 7th century bc 18 west africa edit detailed 9th century bronze of a coiled snake cast by the lost wax method igbo ukwu nigeria sculpture from the ife state using a lost wax casting technique nigeria late 11th 14th century cast bronzes are known to have been produced in africa by the 9th century ad in igboland igbo ukwu in nigeria the 12th century ad in yorubaland ife and the 15th century ad in the kingdom of benin some portrait heads remain 16 benin mastered bronze during the 16th century produced portraiture and reliefs in the metal using the lost wax process 20 egypt edit the egyptians were practicing cire perdue from the mid 3rd millennium bc shown by early dynastic bracelets and gold jewellery 21 22 inserted spouts for ewers copper water vessels from the fourth dynasty old kingdom were made by the lost wax method 22 23 hollow castings such as the louvre statuette from the fayum find appeared during the middle kingdom followed by solid cast statuettes like the squatting nursing mother in brooklyn of the second intermediate early new kingdom 23 the hollow casting of statues is represented in the new kingdom by the kneeling statue of tuthmosis iv british museum london and the head fragment of ramesses v fitzwilliam museum cambridge 24 hollow castings become more detailed and continue into the eighteenth dynasty shown by the black bronze kneeling figure of tutankhamun museum of the university of pennsylvania cire perdue is used in mass production during the late period to graeco roman times when figures of deities were cast for personal devotion and votive temple offerings 13 nude female shaped handles on bronze mirrors were cast by the lost wax process 13 mediterranean edit the lost wax technique came to be known in the mediterranean during the bronze age 25 it was a major metalworking technique utilized in the ancient mediterranean world notably during the classical period of greece for large scale bronze statuary 26 and in the roman world gold ibex figurine from the late cycladic period 17th century bc about 10cm long with lost wax cast feet and head and repoussé body from an excavation on santorini direct imitations and local derivations of oriental syro palestinian and cypriot figurines are found in late bronze age sardinia with a local production of figurines from the 11th to 10th century bc 25 the cremation graves mainly 8th 7th centuries bc but continuing until the beginning of the 4th century from the necropolis of paularo italian oriental alps contained fibulae pendants and other copper based objects that were made by the lost wax process 27 etruscan examples such as the bronze anthropomorphic handle from the bocchi collection national archaeological museum of adria dating back to the 6th to 5th centuries bc were made by cire perdue 28 most of the handles in the bocchi collection as well as some bronze vessels found in adria rovigo italy were made using the lost wax technique 28 the better known lost wax produced items from the classical world include the praying boy c 300 bc in the berlin museum the statue of hera from vulci etruria which like most statues was cast in several parts which were then joined 29 geometric bronzes such as the four copper horses of san marco venice probably 2nd century are other prime examples of statues cast in many parts the artemision bronze c 5th century bc lost wax cast bronze sculpture height 209 cm depicts either zeus or poseidon found near cape artemision 30 examples of works made using the lost wax casting process in ancient greece largely are unavailable due to the common practice in later periods of melting down pieces to reuse their materials 31 much of the evidence for these products come from shipwrecks 32 as underwater archaeology became feasible artifacts lost to the sea became more accessible 32 statues like the artemision bronze zeus or poseidon found near cape artemision as well as the victorious youth found near fano are two such examples of greek lost wax bronze statuary that were discovered underwater 32 33 some late bronze age sites in cyprus have produced cast bronze figures of humans and animals one example is the male figure found at enkomi three objects from cyprus held in the metropolitan museum of art in new york were cast by the lost wax technique from the 13th and 12th centuries bc namely the amphorae rim the rod tripod and the cast tripod 34 other earlier examples that show this assembly of lost wax cast pieces include the bronze head of the chatsworth apollo and the bronze head of aphrodite from satala turkey from the british museum 35 east asia edit bronze ritual altar with extensive patterns from the state of chu in central china before 552 bc there is great variability in the use of the lost wax method in east asia the casting method to make bronzes till the early phase of eastern zhou 770 256 bc was almost invariably section mold process 36 starting from around 600 bc there was an unmistakable rise of lost wax casting in the central plains of china first witnessed in the chu cultural sphere 37 further investigations have rev...