My first bottle of ink that I purchased was Parker Quink Permanent Blue Black, it was what Staples had on the shelf so it was what I bought ($7). Soon afterwards I decided that I would buy a bottle of blue ink too. I agonized over the decision. If I was only going to own one bottle of blue ink, I didn't want it to be the wrong one, and this ink was $9 a bottle at the time so I would have spent $16 on my ink collection, how extravagant! As you can probably tell, I didn't stop at one bottle of blue ink.
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Shading: Difference in colour is due to sheen, not shading.
Bleed Through: More prone to bleed through than many inks.
Show Through: Absorbent papers will exhibit show through.
Saturation: Highly saturated.
Sheen: Metallic burgundy sheen on pooled areas of ink. Absorbent papers do not tend to show this aspect of the ink very well.
Water Resistance: No useful water resistance.
Drying Time: Fairly quick, Less than 15 seconds using an EF nib on Rhodia.
Flow: Good flow. Well lubricated. The nib seems to glide across the page.
Colour Make Up
As can be seen above, this ink is predominantly admiral blue with a small component of violet. It is likely this violet component that shows up in the sheen.
Similar Inks (Images Courtesy of Goulet Pens)
Diamine Majestic Blue is shown above because it has a sheen that is similar to Electric DC Blue.
I like writing with this ink, its excellent lubricity makes any nib feel great upon the paper. Since I always use good quality paper for my correspondence, I never experience the bleed through or feathering that is shown on the copy paper and Field Notes samples. The big problem with this ink is that it is easy to smudge. As with a lot of highly saturated inks, it never seems to be completely fixed to the page and the slightest bit of moisture on your hands can cause it to smudge. It wasn't an issue in this test due the the very dry, winter conditions but it shows up more during the humid parts of the summer.