Adsorbent powders such as Fuller's earth or talcum powder can also be used. These traces have been found in products containing talcum powder, a naturally occurring silicate substance. Talcum powder is applied to the fingers as a lubricant. Newer designs produce effluent primarily consisting of harmless talcum powder/cornstarch and nitrogen gas. Talcum powder is dangerous if inhaled since it may cause aspiration pneumonia or granuloma. Small amounts of scented talcum powder were also used in the annual cleansing rite. Various moisture-absorbing powders, such as talcum or starch, reduce moisture but may introduce other complications. Much of the Martian surface is deeply covered by dust as fine as talcum powder. Regular talcum powder will not reduce the rash but can alleviate burning and itching. Talcum powder has been known to contain traces of asbestos, a recognized human carcinogen. Much of the surface is deeply covered by dust as fine as talcum powder. Talcum powder may be used in some cases. An absorbent, such as talcum powder, was then distributed on the tissue paper. Talcum powder was used for decades but linked to postoperative granuloma and scar formation. Photographs of Quetelet rings on a mirror covered with talcum powder.