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<p>[QUOTE=&quot;BAJJERFAN, post: 2131315, member: 74330&quot;]That seems somewhat dated and not sure why it would be necessary here. As a practicing chemist, I used to make Copper(II)Hydroxide from Cupric Sulfate and sodium hydroxide. It was very slow to filter and equally slow to settle out. Adding a little bit of a flocculant called Separan made the water &quot;slippery&quot; and the Cu(OH)2 settled out much faster. It was essential since the copper compound had to be made free of sulfate ion. Not sure where slippery water fits into the planchet/blank preparation process.[/QUOTE]</p><p><br /></p>

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