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To produce, by etching away unwanted copper, an electronic circuit board designed to meet a specific requirement.The prepared board is immersed in ferric chloride [iron(III) chloride] solution or sodium peroxodisulfate (persulfate) solution to etch away the copper. The board is sometimes cleaned with a solvent before or after soldering, formerly mainly 1,1,1-trichloroethane, now propan-2-ol (isopropanol) or other alcohols (eg, ethanol).
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