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WikiProject Civil engineering (Rated Start-class)
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The beautiful copper sulfate pentahydrate, mentioned in the example, doesn't match the description of the so-called "bluestone" I see on the link. Copper sulfate crystals do form whitish powder when dried (to keep our blue crystals clean, we put an organic protective layer ;). I think the "bluestone" is something else. —Preceding unsigned comment added by (talk) 10:14, 17 March 2009 (UTC)

In example 1, shouldn't "5 micrometre" be 5 molar? —Preceding unsigned comment added by (talk) 04:18, 14 December 2009 (UTC)


I came to complain about the non sequitur of a 5 micron NaCl drop but I believe that the above is correct (solubility fits) and will change it. Really needs a reference. (talk) 05:53, 5 June 2012 (UTC)

Description doesn't match example[edit]

Example 1 does not involve any water of crystalisation, which is specifically referred to in the opening. Is efflorescence the loss of water from crystals, or is it a more general term for crystalisation by evaporation? The article currently contradicts itself. (talk) 06:09, 23 April 2013 (UTC)