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Shibuichi (8125 views - Material Database)

Shibuichi (四分一) is an alloy which can be patinated into a range of subtle muted shades of blue or green, through the use of rokushō treatments. Its name means "one-fourth" in Japanese and indicates the standard formulation of one part silver to three parts copper, though this may be varied according to the desired effect. A 5% silver / 95% copper alloy is also marketed as "shibuichi". A wide range of colours can be achieved using the whole range of alloy compositions, even above 50% silver. 90% Copper and 10% Silver for a dark grey and down to 70% Copper and 30% Silver for lighter greys. It is a common misconception that both copper and silver oxides form, but in fact a detailed study has shown that only copper oxides are formed on the copper rich regions of the material's microstructure, while the silver rich regions are left largely untouched. For most of its history, shibuichi was mostly used to ornament various fittings for katana until the Meiji reforms, when most swordmakers began to make purely decorative objects instead. The material is often used in mokume-gane combinations. Similar alloys have been used elsewhere but the use of shibuichi to achieve different colored patinas appears to have remained nearly unknown outside Japan, until recent interest from artisans in the West. Kuro-Shibuichi (Kin-IchibuSashi)  Kuro is black in Japanese. Kuro-Shibuichi is different from others in the table. Kuro-Shibuichi is mixture of Shibuichi (40%) and Shakudō(60%) with additional 1% of Gold. Roughly proportion of Silver 9.9%, Copper 87.3%, Gold 2.8%. Kuro-Shibuich will develop black patina which is different from the black patina of Shakudo.
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Shibuichi

Shibuichi

Shibuichi

Shibuichi (四分一) is an alloy which can be patinated into a range of subtle muted shades of blue or green, through the use of rokushō treatments. Its name means "one-fourth" in Japanese and indicates the standard formulation of one part silver to three parts copper, though this may be varied according to the desired effect. A 5% silver / 95% copper alloy is also marketed as "shibuichi".[1] A wide range of colours can be achieved using the whole range of alloy compositions, even above 50% silver. 90% Copper and 10% Silver for a dark grey and down to 70% Copper and 30% Silver for lighter greys.[2]

It is a common misconception that both copper and silver oxides form, but in fact a detailed study has shown that only copper oxides are formed on the copper rich regions of the material's microstructure, while the silver rich regions are left largely untouched.[citation needed]

For most of its history, shibuichi was mostly used to ornament various fittings for katana until the Meiji reforms, when most swordmakers began to make purely decorative objects instead. The material is often used in mokume-gane combinations. Similar alloys have been used elsewhere but the use of shibuichi to achieve different colored patinas appears to have remained nearly unknown outside Japan, until recent interest from artisans in the West.

Variation of Shibuichi[3]
name (JA) Ag : Cu, +Au[4] note mentioned colors are after patination
Shibuichi 25 : 75 Dark grey, has a trace of gold
Shiro-Shibuichi 
(Kin-IchibuSashi)
60 : 40, +1 Shiro is White in JA
lighter grey, harder, lower melting temp
Ue-Shibuichi 
(Kin-IchibuSashi)
40 : 60, +1 Ue is Upper in JA
Grey, harder
Nami-Shibuichi Uchi-Sanbu 
(Kin-IchibuSashi)
30 : 70, +1 Nami is Regular in JA
lighter than Shibuichi
Nami-Shibuichi Soto-Sanbu 
(Kin-IchibuSashi)
23 : 77, +1 Darker than Shibuichi

Kuro-Shibuichi (Kin-IchibuSashi) 

Kuro is black in Japanese. Kuro-Shibuichi is different from others in the table. Kuro-Shibuichi is mixture of Shibuichi (40%) and Shakudō(60%) with additional 1% of Gold. Roughly proportion of Silver 9.9%, Copper 87.3%, Gold 2.8%. Kuro-Shibuich will develop black patina which is different from the black patina of Shakudo.

See also


41xx steelAL-6XNAlGaAlloy 20AlnicoAlumelAlluminioLeghe di alluminioCupralluminiAl-LiAmalgamaArgentium sterling silverBronzo arsenicaleRame arsenicaleBell metalBerillioBeryllium copperBiglioneBirmabrightBismanolBismutoOttone (lega)BrightrayBritannia silverBronzoBulat steelCalamine brassGhisaCelestriumChinese silverChromelCromoChromium hydrideCobaltoColored goldCostantanaRameCopper hydrideCopper–tungstenCorinthian bronzeCrown goldCrucible steelCunifeCupronichelCymbal alloysAcciaio DamascoLega di DevardaDoré bullionDuralluminioDutch metalElectrical steelElettroElektronElinvarFernicoFerrolegaFerroceriumFerrochromeFerromanganeseFerromolybdenumFerrosiliconFerrotitanioFerrouraniumField's metalFlorentine bronzeGalfenolGalinstanoGallio (elemento chimico)Gilding metalVetroGlucydurOroGoloidGuanín (bronze)GunmetalHaynes InternationalHepatizonHiduminiumAcciaio super rapidoHigh-strength low-alloy steelHydronaliumInconelIndioInvarFerroIron–hydrogen alloyItalmaKanthal (alloy)KovarPiomboLitioMagnaliumMagnesioMagnoxMangalloyManganinaAcciaio MaragingAISI 316Martensitic stainless steelMegalliumMelchior (alloy)MercuryMischmetalMolybdochalkosMonelMu-metalMuntz metalMushet steelNichromeNichelNickel hydrideAlpaccaNitinolNicrosilNisilOro nordicoOrmoluPermalloyPhosphor bronzePig ironPrincisbeccoMaterie plastichePlatinum sterlingPlexiglasPlutonioPlutonium–gallium alloyPotassioPseudo palladiumReynolds 531RhoditeRodioRose's metalSamarioSamarium–cobalt magnetSanicro 28ScandioScandium hydrideShakudōArgentoSilver steelSodioNaKSolderSpeculum metalSpiegeleisenAcciaio armonicoStaballoyAcciaio inossidabileAcciaioStelliteAcciaio strutturaleSupermalloyAcciaio chirurgicoTerfenol-DTerneStagno (elemento chimico)TitanioTombacTool steelTumbagaLega tipograficaUranioVitalliumAcciaio CortenWood's metalWootz steelY alloyZeron 100ZincoZirconioArgento sterlingArgento tibetanoTitanium Beta CTitanium alloyIdruro di titanioGum metalTitanium goldNitruro di titanioBabbitt (alloy)Britannia metalPeltroQueen's metalMetallo biancoIdruro di uranioZamakZirconium hydrideIdrogenoElioBoroAzotoOssigenoFluoroMetanoMezzanino (architettura)Atomo

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