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Franklin-Christoph Inks (59ml)

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ph scale is 0-14. 7 is neutral. Below 7 is acidic, above 7 is basic. In theory, you want to stay away from heavily acidic inks so as to not damage pens and paper. 

saturation - how much of the ink is absorbed at full color. Good shading means less saturation, and more shades of the color in writing. Deep saturation means full color. 
The traditional bottles are made of glass.

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