A very bright, in-your-face red. Red as a firetruck, with a heavy dose of silver shimmer. The color certainly lives up to its name. It would be a perfect color for grading and corrections, if not for the shimmer. The shimmer makes it a bit too festive for that. So it's not suitable for the workplace, but for greeting cards, short notes or some personal writing, it will work pretty well.
The ink behaves as expected: really good. No feathering, negligible show-through, moderate wetness, good lubrication, and average drying times. Shading is very low and he amount of shimmer is high. It's visible even in medium nibs. With a poster nib it's even too much. The ink doesn't like water.... the ink washes away almost immediately. Funnily enough, the shimmer stays.
Firestorm Red is the brightest red I have. Even Red Dragon is significantly darker. The Rouge Hematite looks much more purple in comparison (that surprised me). Lamy's Ruby is a lot less saturated.
If you like a bright red with heavy shimmer, this ink does the job!