Handblown Antique Apothecary Bottle Full of Soluble Blue PigmentI've found this bottle near impossible to photograph, but the inset detail in the first image gives a sense of the fantastic blue powder inside, which I take to be Soluble (Prussian) Blue. While most definitely a glorious pigment to use for painting or dying (I dissolved a bit in water and it produces beautiful color), I have a notion housed as it is in an antique handblown apothecary bottle that it may have been used for medical purposes; from what I