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Shibuichi (8194 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 20AlnicoAlumel알루미늄알루미늄 합금알루미늄 청동Aluminium-lithium alloy아말감Argentium sterling silverArsenical bronzeArsenical copperBell metal베릴륨베릴륨구리Billon (alloy)BirmabrightBismanol비스무트황동BrightrayBritannia silver청동Bulat steelCalamine brass주철CelestriumChinese silverChromel크로뮴Chromium hydride코발트Colored goldConstantan구리Copper hydrideCopper–tungstenCorinthian bronzeCrown goldCrucible steelCunife백동Cymbal alloys다마스쿠스 강Devarda's alloyDoré bullion두랄루민Dutch metalElectrical steel호박금Elektron (alloy)ElinvarFernicoFerroalloy페로세륨FerrochromeFerromanganeseFerromolybdenumFerrosiliconFerrotitaniumFerrouraniumField's metalFlorentine bronzeGalfenolGalinstan갈륨Gilding metal유리GlucydurGoloidGuanín (bronze)GunmetalHaynes InternationalHepatizonHiduminiumHigh-speed steelHigh-strength low-alloy steelHydronaliumInconel인듐InvarIron–hydrogen alloyItalmaKanthal (alloy)Kovar리튬Magnalium마그네슘Magnox (alloy)MangalloyManganinMaraging steelMarine grade stainlessMartensitic stainless steelMegalliumMelchior (alloy)머큐리MischmetalMolybdochalkosMonelMu-metalMuntz metalMushet steel니크롬니켈Nickel hydride양은Nickel titaniumNicrosilNisil노르딕 골드Ormolu퍼멀로이Phosphor bronze선철Pinchbeck (alloy)플라스틱Platinum sterlingPlexiglas플루토늄Plutonium–gallium alloy칼륨Pseudo palladiumReynolds 531Rhodite로듐Rose's metal사마륨Samarium–cobalt magnetSanicro 28스칸듐Scandium hydrideShakudōSilver steel나트륨나크땜납Speculum metalSpiegeleisenSpring steelStaballoy스테인리스강강철StelliteStructural steelSupermalloySurgical stainless steelTerfenol-DTerne주석 (원소)타이타늄TombacTool steelTumbagaType metal우라늄VitalliumWeathering steel우드 합금Wootz steelY alloyZeron 100아연지르코늄스털링 실버Tibetan silverTitanium Beta CTitanium alloyTitanium hydrideGum metalTitanium goldTitanium nitride배빗메탈Britannia metal퓨터Queen's metalWhite metalUranium hydrideZamakZirconium hydride수소헬륨붕소질소산소플루오린메테인Mezzanine원자

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