WES is an acronym for The Writing Equipment Society, an organization for which the ink was named. I personally find it to be a very boring shade of blue...but that's just me. I way prefer Diamine Midnight.
Here's the review -- I darkened the image because the original photo showed the ink as being too light. Likewise, the darker areas on the color swatches in the Ink Comparison section show where I had to use Photoshop for color-correction.