Pure cerium oxide polish is frequently white in coloration. As being the purity declines the color departs from white - generally to yellow, then to orangy or pinkish. These marks are wiper sweep marks, regular on a lot of glass. In particular, Porsche proprietors complain of their windscreens becoming stricken https://metallography10975.spintheblog.com/35260896/cerium-oxide-things-to-know-before-you-buy