Tango is an orangey-brown. Not quite orange, but not quite brown either. I think it's closer to orange so let's call it an orange.
In large swabs there is a hint of gold where the ink pooled.
Let's take a look at how the ink behaves on fountain pen friendly papers: Rhodia, Tomoe River, and Leuchtturm.
Dry time: 15 seconds
Water resistance: Low
Show through: Medium
On Staples 24 lb copy paper there was feathering and just a little bit of bleeding.
Overall, it looks more orange in writing than it does on the Col-o-ring swab. It's pretty well behaved, and an interesting color. It does dry pretty quickly, which is a nice bonus.
Disclaimer: A sample of this ink was provided by Pen Chalet for the purpose of this review. All photos and opinions are my own. This page does contain affiliate links, but is not sponsored in any way.