Besides The Preceding There Is A Basic Prussian Blue Formed By

: ON THE PRIMARY, BLUE.

simply submitting to the air the bluish-white precipitate which falls on

adding yellow prussiate of potash to green vitriol. This compound

dissolves entirely by continued washing with water, yielding a beautiful

deep blue solution, from which the colour may be thrown down in a solid

form by the addition of any salt. Probably it was this basic

preparation, so cheaply and easily made, that conferred upon Prussian

blue the character of staining paper. In name, there is also another



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