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Treatment; 18 Jan 2010; Clean to remove soil deposits and corrosion.; Metals

Reason: Permanent Exhibition
Description: Burial deposit softened by immersion in 3% Synperonic A7 (non ionic detergent,nonylphenol ethylene oxide condensate) in tap water then brushed with soft sable brush. Further surface deposit removed with 50:50 Industrial methylated spirits (ethanol,methanol) to de-ionised H2O applied with cotton wool swabs. Corrosion crust /deposits (silicates possibly combined with displaced lead) reduced by immersion in bath of 10-15% Formic acid in de-ionised water and placed in ultrasonic tank for 10 seconds. Object brushed with soft sable brush in running tap water and allowed to rinse in running tap water for 30 minutes. Cleaned manually using scalpel, pin vice, cactus spine and porcupine quill. Substantial deposits softened with local applications of 15% Formic acid in de-ionised water applied with cotton wool swabs. Second neutralising process by rinsing in running tap water for 40 minutes. Object swabbed with Industrial methylated spirits (ethanol,methanol).
Details: Treatment

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