I have a bunch of nice reds – reddish purples and the sun and light made it tempting to compare them side by side in the sun. I’ve used a brush and a Lamy Safari EF on a Rhodia pad.
My current favourites are the Red-Black Black Swan (Noodler’s) that works well for letter writing and is beautiful in broad italics, the vibrant PR Plum, the likewise and special Yama Budo (Iroshizuku) and J Herbins intense and saturated 1670 (lovely in a wet, flexy nib) and the very winey Montegrappa Bordeaux. All of them are dark enough to use for journalling and letter writing.
paper 1 – lighter reds top-down: Rohrer & Klingner Morinda, Iroshizuku Momiji, J Herbin Rouge Bourgogne, J Herbin Rouge Caroubier, J Herbin 1670 Hematite, Stipula Calamo Cherry Red
paper 2 – dark reds – reddish purples top-down: Diamine Monaco Red, Visconti Bordeaux, Montegrappa Bordeaux, Noodler’s Black Swan, Iroshizuku Yama Budo, Private Reserve Plum.