I usually use a fine ballpoint pen in blue, black or red to write things in my Filofax, notebook or journal. Every now and then I switch to fountain pen (I have a lovely Montblanc Meisterstuck which my husband gave me almost twenty years ago) in blue-black, but I tend to switch back after a while. For several reasons – I am left handed so my hand smears wet ink. I also need to write quickly and close my Filofax which also smudges the ink. As well as that, I hate the thought of losing such an expensive pen.
My schedule changes from hour to hour which means that my Filofax ends up full of confusing scribbles. To prevent myself ending up at the wrong place at the wrong time I usually just rewrite badly scribbled out pages.
This year, however, I have been using pencil. What a difference it has made! I have never used pencil before because my hand smudges HB and it seems so impermanent. Now I am sorry I didn’t switch sooner. I can erase and rewrite as many times as I want. I use 2H leads – for my journal I use an Edwardian pen from 1901 and for my Filofax I use a Pentel GraphGear 500 in 0.3mm width.
Pencil is waterproof and only fades when exposed to light so as long as I keep my book closed it has been fine so far.