... 0.5% to 0.6%, according to the wire drawing conditions, adjust the level of concentration. For the ... into the tank later. It may be foaming when drawing started, but after using the 1-2 times, ... turn black and stank, then you can run the machine for times, after aeration, color and odor disappears, ... Light yellow coating on the wire surface is the perfect state when water tank drawing, it is good for ...