How to accquire black roses?

Like the title says, I am meeting this girl who 1 really like and I wanna make an impression. She loves the color black and roses. So I want to know if anyone knows how to dye a flower??? Or if I can buy them anywhere in ncr or noida? I dont mind travelling a long time if it means I couls get one Tldr: How do I make or dye a black rose