Waterman Serenity Blue is a reliable standard blue with shading and red sheen. It’s so reliable that it is frequently used as a diagnostic and testing ink in pens to rule out ink problems. It’s considered safe to use in both modern and vintage pens, and it even has some water resistance.
Scans
There is significant shading on Iroful and MD, though there was also some feathering and bleeding on Iroful.
Photos
The red sheen is heavy in the large swatches.
The sheen sticks mostly to the outline in writing.
Microscope
Nothing too novel in the microscope photos that hasn’t already been noted, but it does look nice.
Chromatography
There is only a narrow band of dark cyan that quickly fades, as is common with water-resistant inks.
There is only a thin blue glowing line where the water stopped, there was no glow on the swatches.
Verdict
It’s a very trustworthy ink, and it looks great. I’ve used it several times with success, but I don’t usually load it up unless I am not sure if a pen is misbehaving because of ink or a problem in the pen itself.
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