Original Porsche Motor 2000 GS Drawing BluePrint Auto
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Original Porsche Motor 2000 GS Print Draft. Here I have an Porsche Motor Draft on blueprint paper. Would look great framed. Like a photographic negative, except in reverse, the velum produces the completed product of the chemical bath and a blueprint is produced. Blue-line prints get their names because they have a blue lines on a Blueish background. It sounds almost too simple, doesn't it? Blueprinting paper isn't just ordinary paper. It's coated with ammonium iron citrate. The formation of this compound is shown below. Amazingly enough, the structure of this inorganic compound isn't known, but we do know that iron is in the +3 oxidation state. Next, the blueprinting paper, with the original drawing on top, is exposed to light. All the iron +3 ions, except those directly under the tracing lines, are reduced to iron +2. The blueprinting paper, which is still white, is placed in an aqueous solution of potassium ferricyanide. This compound reacts with ammonium ferrous citrate and forms a compound called Prussian blue. This compound, in it's hydrated form, is blue. The structure of Prussian blue, also known as Turnbull's blue, is still under debate. Now deserving of its name, the blueprint is washed. Prussian blue adheres to the paper while the unreduced iron +2 compounds washes away. Very cool process indeed! These measure approximatly
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