Synthetic Red Iron Oxide (high purity 325 mesh) - Brackers Good Earth Clays

Synthetic Red Iron Oxide (high purity 325 mesh) - Brackers Good Earth Clays

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Bracker's Good Earth Clays provides clay and other ceramic materials, equipment, tools, and toys to potters and sculptors in Kansas, Missouri, Nebraska, Iowa, Arkansas, Oklahoma, Illinois and beyond. In Lawrence Kansas since 1982.
Ceramics%20Monthly%20Technofile%20article%20from%20March%202011%20%22All%20about%20iron%22%20by%20John%20Britt%20%26nbsp%3BIron%26mdash%3BThe%20fourth%20most%20common%20element%20in%20the%20earth%26rsquo%3Bs%20crust%20and%20the%20most%20common%20element%20(in%20terms%20of%20mass)%20on%20the%20planet%2C%20comprising%2035%25%20of%20the%20earth%26rsquo%3Bs%20core.%20%20Melting%20Point%3A%202795%26deg%3BF%20(1535%26deg%3BC%20)%20Toxicity%3A%20Non-toxic%20%20%20Datasheet%20from%20manufacturerSafety%20Data%20Sheet%20(SDS)%26nbsp%3B%20%20%20PLEASE%20NOTE%3AIf%20you%20are%20mixing%20up%20a%20Steven%20Hill%20glaze%20that%20calls%20for%20%22High%20Purity%20Red%20Iron%20Oxide%2C%22%20he%20gets%20his%20materials%20through%20another%20source%20-%20US%20Pigment.%20Steven%20has%20said%20that%20his%20Red%20Orange%20glaze%20will%20NOT%20turn%20out%20as%20expected%20if%20you%20use%20a%20different%20iron.%20Steven%20went%20on%20to%20tell%20me%20that%20using%20the%20US%20Pigment%20version%20of%20the%20high%20purity%20red%20iron%20oxide%20is%20not%20as%20critical%20in%20the%20Juicy%20Fruit%20glaze%20recipe.%20Synthetic%20red%20iron%20oxide%20is%20the%20most%20common%20colorant%20in%20ceramics%20and%20has%20the%20highest%20amount%20of%20iron.%20It%20is%20available%20commercially%20as%20a%20soft%20and%20very%20fine%20powder%20made%20by%20grinding%20ore%20material%20or%20heat%20processing%20ferrous%2Fferric%20sulphate%20or%20ferric%20hydroxide.%20During%20firing%20all%20irons%20normally%20decompose%20and%20produce%20similar%20colors%20in%20glazes%20and%20clay%20bodies%20(although%20they%20have%20differing%20amounts%20of%20Fe%20metal%20per%20gram%20of%20powder).%20Red%20iron%20oxide%20is%20available%20in%20many%20different%20shades%20from%20a%20bright%20light%20red%20at%20a%20deep%20red%20maroon%2C%20these%20are%20normally%20designated%20by%20a%20scale%20from%20about%20120-180%20(this%20number%20designation%20should%20be%20on%20the%20bags%20from%20the%20manufacturer%2C%20darker%20colors%20are%20higher%20numbers)%2C%20however%20in%20ceramics%20these%20different%20grades%20should%20all%20fire%20to%20a%20similar%20temperature%20since%20they%20have%20the%20same%20amount%20iron.%20The%20different%20raw%20colors%20are%20a%20product%20of%20the%20degree%20of%20grinding.%26nbsp%3B%20%20In%20oxidation%20firing%20iron%20is%20very%20refractory%2C%20so%20much%20so%20that%20it%20is%20impossible%2C%20even%20in%20a%20highly%20melted%20frit%2C%20to%20produce%20a%20metallic%20glaze.%20It%20is%20an%20important%20source%20for%20tan%2C%20red-brown%2C%20and%20brown%20colors%20in%20glazes%20and%20bodies.%20Iron%20red%20colors%2C%20for%20example%2C%20are%20dependent%20on%20the%20crystallization%20of%20iron%20in%20a%20fluid%20glaze%20matrix%20and%20require%20large%20amounts%20of%20iron%20being%20present%20(eg.%2025%25).%20The%20red%20color%20of%20terra%20cotta%20bodies%20comes%20from%20iron%2C%20typically%20around%205%25%20or%20more%2C%20and%20depends%20of%20the%20body%20being%20porous.%20As%20these%20bodies%20are%20fired%20to%20higher%20temperatures%20the%20color%20shifts%20to%20a%20deeper%20red%20and%20finally%20brown.%20The%20story%20is%20similar%20with%20medium%20fire%20bodies.%20%20In%20reduction%20firing%20iron%20changes%20its%20personality%20to%20become%20a%20very%20active%20flux.%20Iron%20glazes%20that%20are%20stable%20at%20cone%206-10%20in%20oxidation%20will%20run%20off%20the%20ware%20in%20reduction.%20The%20iron%20in%20reduction%20fired%20glazes%20is%20known%20for%20producing%20very%20attractive%20earthy%20brown%20tones.%20Greens%2C%20greys%20and%20reds%20can%20also%20be%20achieved%20depending%20on%20the%20chemistry%20of%20the%20glaze%20and%20the%20amount%20of%20iron.%20Ancient%20Chinese%20celadons%2C%20for%20example%2C%20contained%20around%202-3%25%20iron.%20%20Particulate%20iron%20impurities%20in%20reduction%20clay%20bodies%20can%20melt%20and%20become%20fluid%20during%20firing%2C%20creating%20specks%20that%20can%20bleed%20up%20through%20glazes.%20This%20phenomenon%20is%20a%20highly%20desirable%20aesthetic%20in%20certain%20types%20of%20ceramics%2C%20when%20the%20particles%20are%20quite%20large%20the%20resultant%20blotch%20in%20the%20glaze%20surface%20is%20called%20a%20blossom.%20%20Iron%20oxide%20can%20gel%20glaze%20and%20clay%20slurries%20making%20them%20difficult%20to%20work%20with%20(this%20is%20especially%20a%20problem%20where%20the%20slurry%20is%20deflocculated).%20%20Iron%20oxide%20particles%20are%20very%20small%2C%20normally%20100%25%20of%20the%20material%20will%20pass%20a%20325%20mesh%20screen%20(this%20is%20part%20of%20the%20reason%20iron%20is%20such%20a%20nuisance%20dust).%20As%20with%20other%20powders%20of%20exceedingly%20small%20particle%20size%2C%20agglomeration%20of%20the%20the%20particles%20into%20larger%20ones%20can%20be%20a%20real%20problem.%20These%20particles%20can%20resist%20break%20down%2C%20even%20a%20powerful%20electric%20mixer%20is%20not%20enough%20to%20disperse%20them%20(black%20iron%20oxide%20can%20be%20even%20more%20di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Brackers Good Earth Clays Serving Kansas, Missouri, Nebraska, Oklahoma, Iowa, Arkansas & Illinois and beyond

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Synthetic Red Iron Oxide (high purity 325 mesh) - Brackers Good Earth Clays

Brackers Good Earth Clays Serving Kansas, Missouri, Nebraska, Oklahoma, Iowa, Arkansas & Illinois and beyond

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Brackers Good Earth Clays Serving Kansas, Missouri, Nebraska, Oklahoma, Iowa, Arkansas & Illinois and beyond

Spotlight: Nick Joerling shifts gears Techno File - Ceramic Arts Daily