This 50ml plastic bottle of Robert Oster Signature Purple Rock fountain pen ink is a muted shade of purple. The 50ml bottles are manufactured in Australia of food grade BPA-free PET, completely recyclable and manufactured in a carbon neutral process, something that founder Robert Oster is extremely proud of.
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Volume - 50ml Bottle Material - Plastic Color Group - Purple
Purple rock dries an almost-soft-black pale purplish blue. If you can picture that ... Great for writing, since it's not dull navy, black, purple nor royal. It's something else altogether. I will be purchasing again.