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solomon levi
08-27-2010, 11:26 PM
some of these are made with prussian blue:
"Mrs. Stewart's Bluing is a colloidal suspension of extremely minute particles of blue powder (Ferric Hexacyanoferrate). This is not a solution in the true chemical meaning of that word."

others are made of ultramarine which has as its base a sodium aluminum silicate, such as that found in lazurite and lapis lazuli.


http://www.oldandinteresting.com/buy-laundry-blue.aspx