Wanted to make this it's own thread so folks didn't have to read my previous thread. I took a look at outside of first couple of feet of my liner from the bottom. First used a dull flashlight and liner was mostly copper colored , which I know is normal. There was also faint purple visible. When I switched to a better brighter flashlight, the liner just looked copper colored. I would have included a pic but would likely would not have shown the slight purple color that was somehow more visible with lower light flashlight. What do you all think?