An overview of the inks within this review series is available here. Again we have a Document ink that has a colour that is true to form. Dark Blue is a nice shade of Blue Black that feels well lubricated as it goes down on the page and dries quite matte. Like the regular blue offering, this colour deeply penetrates the paper so that bleed through and show through are the major problems with this ink.
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Bleed Through: This ink is an aggressive bleeder.
Show Through: The deep penetration as well as the deep colour of this ink make the backsides of absorbent paper unusable. You could use the back of Rhodia but probably would choose not to.
Saturation: Average saturation.
Water Resistance: 100% waterproof.
Drying Time: Average dry time, 15-20 seconds using an EF nib on Rhodia. Dry time is almost instant on absorbent papers.
Flow: Average flow. Higher than average lubrication.
Cleaning: Easy to clean. Just a thorough flushing required.
Colour Make Up
The bulk of the colour is the dark blue pigment but there is some violet where the sample was placed on the wicking medium.
Similar Inks (Images Courtesy of Goulet Pens)
The Salix has water resistant properties. The Tanzanite is similar in colour only.
My feelings about this ink are very similar to the feelings I had for the regular Blue; it is enjoyable to write with but the bleeding ruins the overall experience. It is not hard to find Blue Black inks that are water resistant and a lot of them have more interesting properties than this one. Waterproof Blue Blacks aren't quite as prevalent. My gut tells me that most users would do better with a good water resistant Blue Black like Sailor Sei-Boku or Rohrer & Klingner Salix, both of which have nice shading, rather than this one. If you have decided that you will be making custom colours by mixing the inks in the Document Ink line then you should buy a bottle to have on hand.
Other Reviews For This Ink
I reached out to Goulet Pens and asked if they would be willing to supply samples of the complete line of De Atramentis Document Inks. While they were out of stock in the Black and Brown variants, they kindly provided samples of the rest of this line to me free of charge. I do not feel that my opinions of this ink have been affected by receiving the sample free of charge.