That fluid was still good, but next time look at finding the return line from the tranny to the engine. Then after you drop the pan and button it up and fill it up, have someone slowly pour your fluid down the neck as you have the return line emptying into a container. Many youtubes on it, when I get around to doing mine I'll post it up. 100% safe flush. Just like brake stuff, when you see the liquid go clear, your done. Way easier to do tranny then brakes, cause brakes you have to do 4 points and have someone pump the brakes. Just like you don't want the master cylinder to go dry, you don't want the TqC to go dry. Both methods fairly safe, the return line doesn't spit faster then you can put it down the neck.