I got a white (and silver) Sakura Gelly Roll pen recently and tried it out in my sketchbook. For the fantasy landscape, I used it for the stars and on the teapot, I used it for the floral design. I haven’t used a white pen since I was a child but I remember the same frustrating feeling of inconsistent ink flow, ink that wasn’t truly opaque and visible scratches in the ink from the metal nib. Even still, it is satisfying to see the white lines on a dark background. In some of the facebook sketching groups I am a part of, the Uni-ball Signo Broad UM-153 Gel Pen is recommended because the ink flow is very smooth and opaque. I think I will definitely try the Uni-ball pen out in the future. If you have another recommendation for a white gel pen, please let me know in the comments.