I've always bought mineral spirits from a big box store or local hardware store. It has always been in a metal can. The color is clear. Yesterday I saw a gallon at a local Wallyworld that was in a white plastic jug. It was about $4.00 cheaper per gallon then that in the steel can. I bought it and when I went to use it, the color was a milky white. Is this normal? Has the mineral spirits possibly leached the white off of the jug? Is it safe to use as a mix for stains and varnishes? I know this is a lot of questions, but I'm confused on this. Thanks, Steve.