The National Archives made a blue ink using a phthalocyanine pigment, which
was ground into a very high molecular weight alcohol, then diluted with a
much lower molecular weight one, and finally some water.  We had the pigment
in dry form, however when we looked into the repurchase, it was only
available dissolved in water, which emphasizes the point that the pigment
had to be ground into a very insoluble alcohol to protect it from water
solubility.-Su (who used to do this)

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