All new tyres have visible coloured markings forming a radial band on the tyre. Several of these markings represent destination between the manufacture and the recipient.... Cars like Lexus require specific compounds so the radial markings do indeed allow the process to become visible and act like a bar code.   But there is also important information held within those lines that most consumers and tyre centres are not aware of, in particular the position of the outer line (colour does vary)...