IF you’re actually curios, it was because we used to import them, and the importers would dye them red due to discoloration in how they were harvested. Domestic production ramped up in the US and since pistachios didn’t have to travel as far, and because modern harvesting was more mechanized. It was easier to wash, dry, roast and salt them in a shorter time period avoiding the discoloration that required the dye in the first place.

I see, so that’s why they have never been red outside the US

Ok that makes sense because I (a 30+ yo canadian) was so confused.

It’s also about ten years out of date, 25 year olds today probably wouldn’t recognize this

I’m 47 and have never seen this. I only remember pistachios in ice cream but they werent fucking red.