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bottle size:
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65 ml glass bottle in one color and 15 ml glass bottle of a second  ink color
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ink color:
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made from extremely high quality plant based materials; no chemical odors
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ink also:
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treated with an antibacterial and hydration properties which helps the ink not dry our or deteriorate in the pen as easily.
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pH:
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optimal pH 7-8 which is neutral.
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