1) Lubrication (Parker)
Parker is slightly (almost unnoticeable) more lubricative. I'm using very smooth paper so I can feel it slightly and I write a lot but for most purposes and in most instances this would not really be noticed I think.
2) Saturation (Sheaffer)
Sheaffer is slightly blacker. To be honest I first put it as a tie because they are so similar in colour but I think Sheaffer is slightly blacker.
3) Wetness (tie)
Absolute tie. For me the same in any respect in terms of wetness/flow.
4) Water (Sheaffer)
I'm really surprised by Sheaffer black is really resistant to water. It will weaken but leaves very, very visible and black marks so to me it's pretty much as resistant as Lamy Blue Black which is iron gall. Surprisingly after bleach it left a yellow line so even bleach can't remove it completely. Parker slowly but surely disappears.
It should be noted that Sheaffer black when bleached goes from black to redish to yellow. Parker goes to turquoise to nothing (I think it did leave a yellowish line to be honest but I kept the bleach for a very short time 2-3 min). The make up of the inks seems to be different - one is red-based and the other blue-based black.
Both are very good inks. I like them both and think they are pretty much substitutes. I have Parker Red and Sheaffer red and Waterman red so I'll try to compare those next when I have time.
PS Sheaffer Skrip Red is a very good ink I thought. If you like red I'd give it a try. I was surprised how good it was - very smooth and a very nice colour.
Edited by s5s, 22 January 2012 - 22:35.