Pelikan and Lamy blue are school inks, that wash out of cloths easy. Pelikan even makes an ink eradicator for it's 4001 blue ink that can be used on Lamy and Watermans.
Royal Blue will shade on good to better paper...90g or better...........but it's not an ink I grab. It lacks a little pizazz.
But back in the dark ages...'60's in the States, imported Pelikan inks were cheaper than Sheaffer and Parker inks.
So when I got back to fountain pens a decade ago, the first thing I did was run out and buy some Royal Blue and black....third ink was the then basis turquoise, by Lamy. (well I was in Germany)
Pelikan 4001 makes a good turquoise, violet ...the brown is a bit red....and if you can find some on Ebay get some discontinued Brilliant Green near as good as R&K's Verdurqa or MB's Irish Green, but much cheaper than 19E for MB. The dark green is ok....
I didn't mind them adding a dark green for the multitude that liked that, but in green-green inks Pelikan 4001 two toned shading Brilliant Green started me buying 14 greenish inks with in a year.
You have to smuggle blue black in...order a batch of Pelikan inks from Germany....lots of solks smuggle a bottle or two in. A great blue black ink, well liked by everyone.
I have both Lamy and Pelikan Royal Blue but my Royal Blue as a go too ink is my DA Royal Blue. Is darker, more lubricated. It replaced my Waterman Blue as my wet ink.
Way back in the dark ages Waterman was a wet ink.
But not compared to many Japanese inks, and many Noodler users consider Waterman a dry ink.