I'm ordering some fast flight string material online. I have found some places that sell black spools only that are pretty cheap. To get a second spool of a different color from another site will add alot to the cost. So here's my question... When making a flemish loop, do you really need two different colors or can I do it just as easily with only black. From the couple of strings that I made with two colors i can imagine that it is easier to see what you're doing with contrasting colors but if I could just order a black spool and get away with that, I'd save alot of money and earn some brownie points with the wifey. Thanks in advance for your input.