Diamine has quite a number of blue inks in their lineup. Presidential Blues looks really like most blue. I am guessing why it is called Presidential Blue is because it looks similar to the blue of the American flag. Diamine Presidential Blue doesn't stand out like Pilot Iroshizuku Kon Peki. It is neither too bright nor too dark. It is pretty much a middle of the road kind of blue. This colour reminds me more of Pilot Iroshizuku Asa Gao. It is a well behaced ink with great shading properties. However it did showthrough quite badly on my Field Notes Memobook but all is well with my Kokuyo paper.