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not quite a review, more of an observation.
this is a great deal.
your average cheap pen holds 0.27ml. you can get 10 pens for a dollar, meaning 2.7ml per dollar. on art primo currently, these run for 13 USD. 2.7x13 is 35.1, meaning for 13 dollars worth of pens, you can get 35.1ml of ink. these BPF bottles are 100ml. therefore, you are getting approximately 2.8x as much ink for the same price.
to go even further, lets say you use 10 pens per fluid ounce of solvent for pen ink. this means that you are getting 32.7ml of ink per dollar. 32.7x13 is 425.1, so for 13 usd, you are getting 425.1ml of finished ink. now, 13 dollars of bpf is 100ml. 100x10 is 1000, plus the amount of bpf, 100, is 1100. so, for 13 dollars you can get 1100ml of finished ink.
reminder that these are approximate calculations, and your results may vary, but at face value this stuff is great.
Rating:  [5 of 5 Stars!]
16 of 17 found this review helpful - did you?
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[4 of 5 Stars!]