The paper was thin and yellowed with worn edges. Bluing is not permanent and rinses out over time leaving dingy or yellowed whites. Foliage may become small, sparse and yellowed. These pigments are generally whiter in an acid medium and yellowed in an alkaline medium. This explains the yellowed or tanning paper condition, more noticeable in some books than others. This protective coating has yellowed with age, resulting in the golden hue seen today. Raking light revealed that modern varnishes had yellowed, while further overpainting was found. Long-term effects include bad breath, yellowed teeth, and an increased risk of oral cancer. Adhesive mounts and backing for a range of fasteners have become yellowed and embrittled. The walls are covered with thousands of yellowed business cards and dollar bills. Lake sturgeon eggs begin yellowed and are attached to a fatty ovarian mass. A yellowed student cap is taken as a sign of prestige.