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INK : DIAMINE PRESIDENTIAL BLUE 
PAPER : RHODIA #16 A5 white lined

 PEN : Onoto Magna 261 Medium nib tweaked for wet flow by John Sorowka (Oxonian).

 Scanner : IT8-calibrated Epson V600 flatbed
 Colour Space : Adobe RGB 
Matte : 50% grey and 100% white 
Post-process : Unsharp Mask Colour Balance : Neutral http://www.dcoffey.co.uk/images/fountainpennetwork/ReviewPresidentialBlue.jpg

 WATER RESISTANCE : I found that once dry, Diamine Presidential Blue is moderately water-resistant. A large amount of the colour lifts but what is left behind is reasonably legible. DRYING TIME : Fairly brisk for a Diamine. I found that 20s was about right for copy paper and a little longer for Rhodia. This was from a well-cleaned pen with very high flow however. BLEED THROUGH : I saw moderate bleed-through on Pukka 80gsm copy paper but none on Rhodia. LUBRICATION : Presidential Blue is very smooth under the nib and I did not experience any starting issues even in hot weather. Lubrication is excellent for a Diamine and it was a pleasure to write with. 
http://www.dcoffey.co.uk/images/fountainpennetwork/ReviewPresidentialBlueSwab.jpg Diamine Presidential Blue is a cheerful mid-blue with just a hint of turquoise. It flows from the nib a little darker as a deep mid-blue, but lightens as it dries. http://www.dcoffey.co.uk/images/fountainpennetwork/ReviewPresidentialBlueShade.jpg In a wet pen on hard paper, Presidential Blue shades wonderfully. The effect is lessened by copy paper. The ink does not smudge at all once dry. http://www.dcoffey.co.uk/images/fountainpennetwork/ReviewPresidentialBlueWater.jpg The ink is somewhat water-resistant. While a lot of the blue did lift and run, a good residual line remained behind.