I have used and reviewed all five of the KWZ dye-based Azure inks, and I like the whole family, but I think we could use a sort of cheat sheet.
Here are links to the full reviews:
Together the five Azure comprise a nice range of blue inks that are low-maintenance and nicely saturated. Azure #1 kicks things off as KWZ’s traditional or standard blue, and it is the lightest and least saturated of the five. Azure #2 is a darker blue but still in the standard range. With the next three Azures, we get more fun, offbeat and vibrant shades of blue.
My quick summary goes something like this:
Most standard: Azure #1.
Most serious: Azure #2.
Most lively: Azure #3 wins by a whisker. But Azure #4 and Azure #5 also have a great kick.
Most uncommon shade of blue: Azure #4.
Most like Parker Penman Sapphire: Azure #3. Not a clone, though. Azure #5 has something of the PPS feel, too.
Best on poor paper: Azure #2 and Azure #5.
Most dry: Azure #2 and Azure #3.
Most wet: Azure #4 and Azure #5.
Best shading: Azure #4.
Best sheen: Azure #4.
Easiest to clean: They all clean out wonderfully easily.
Most water resistant: Azure #2. With a big “but.” On normal paper they’ll all soak in sufficiently. On fountain-pen friendly paper, none is actually water-resistant, but Azure #2 seems to survive the best of the five.
Best for a Lamy Safari: Azure #4. This is a category of interest to exactly one person in the entire world. But that would be me.
Most swoon-worthy: Azure #3 (more dry) and Azure #5 (more wet).
I think they are all excellent. I received samples of Azure #2 and Azure #3 from KWZ to do those reviews.
Fountain Pen Follies 
Such a helpful reference to see all five side by each, thanks for doing this!
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This is very helpful, thank you so much! 🙂 #4 is my favourite. My eyes were drawn to it immediately. #3 is a close second with #5 behind it. #1 and #2 didn’t do anything for me.
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