Red Fox is a Montblanc Limited Edition, based on their Le Petit Prince series. The ink is a dark brown orange, not unlike the fur of a fox. I wasn't sure what to expect of this ink to be honest, reviews are mixed, but in the past week I have been writing a lot with it. It's great for personal use and at the same time, despite being a dark orange, it's a color that you can easily use in an office environment to take down notes. For longer reads the color remains pleasant.
The ink and its color surprised me and I must say, I really like this ink. At 35 euro for 50 ml the ink is expensive, but well worth it.
It's a high quality ink. As expected, no feathering, no bleed-through on decent paper, shading is strong and excellent and the ink behaves extremely well in my Parker Duofold (medium nib). Lubrication is a bit better than most Montblanc inks I know but still, some pens have difficulties with it. TWSBI and Montblanc is not a good combination in my experience. This is a non permanent ink, water will severely damage your writing. Drying times are OK.
To give an idea what the ink looks like, I have written several samples with both the Parker and a Lamy with a broad nib. The orange is very distinctive and quite different from other inks I own. At first I thought it would be closer to a red, but but the two colors that come closest are Orange Indien (J. Herbin) and Cornaline d'Egypte (Herbin 1798).