One of my favorite summertime memories was having mint chip ice cream back when I grew up in New England, which we ate outside and had ordered from a window at our local dairy. Even though the ice cream was freshly made, they made sure it bright-bright-green, so we knew we were eating mint, I guess.
I remember a few years later, after the dairy closed, when we bought a tub of Breyers ‘all-natural’ ice cream at the supermarket and I lifted the lid off the tub of mint chip ice cream only to be surprised to find that mint ice cream wasn’t really green at all, but almost pure, snowy white, save for the chunks of chocolate studded about here and there.
When I wanted to come up with my own mint ice cream recipe, I used handfuls of fresh mint leaves for flavor, unlike what the store-bought stuff is made from, so it had a leafy, herbaceous flavor. A few people noted to me at various times that their mint-infused milk didn’t get the delicate green hue that mine has, but mint is a plant and most plants aren’t standardized—at least not the ones I want to eat.
So, naturally there will be variations in strength and color depending on the mint that you use. If you’d prefer to have absolute certain, 100% standardized results, you could simply make a plain vanilla ice cream and add mint extract or crème de menthe in lieu of the vanilla, but I’ll stick to using only fresh mint in my ice cream.