When I first wrote this review, I made the assertion that the Abraxas Koenigsblau was nearly indistinguishable from Diamine Presidential Blue. I still feel that they are very close, and when the Q-Tip swabs went down onto the paper, I could NOT tell them apart. Once dry, however, the Diamine has more of a teal hue, leaning toward green, and the Abraxas retains more of a deeper, sapphire base color. This difference is not readily apparent until the inks dry completely, and is not easily seen on the scans.
EnlargeWaterproof? Nope.