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AllIn1

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Hi everyone, I have been reading this forum for months, but this is my first post. I am new to soldering, and I use the OATEY H20#5 lead free flux, I have tried their regular #5, and the #95 tinning flux, as well as their water soluble tinning flux. I really didn’t like the water soluble tinning flux, but the rest all seem ok. My question relates to the corrosion inside the pipe from the areas where the heated flux came into contact with. I don’t know if I am doing something wrong and that is why this is happening, I am very conservative with the amount of flux I use, but basically anywhere the hot flux touches, turns an orange color that looks like rust on steel. I already know that copper does not rust and it develops a protective patina, but I have also heard it develops a protective film inside the pipe to protect against bacteria and pathogens, and I am worried this could effect the development of that protective film. Or am I just being overly paranoid and this is completely normal and not harmful?
 

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