I tried raspberry shoots, because I had access to them, and they were listed in books. Standard recipe for raw leaves, collect as many as you can, soak overnight, boil for 15-20 min, let cool, strain, add mordant and dye. The left one with alum, the right one with iron. First shade after 20 min, second after an hour, third overnight. I was not very impressed with the result, but still it’s not nothing.
Here is a comparison with chestnut leaves (on the left) and oak leaves (on the right):I would pick chestnut over raspberry any day, and yet if you don’t have one, and do have the other, you might want to give it a try. It can give you a decent yellow with alum after a couple of hours, or if you’re after aged look with that grey with iron, that could also be interesting, especially in combination with other colors.