Concentrated sulfuric acid dissolves dry glucose without blackening at room temperature forming sugar sulfuric acid. Teeth blackening or teeth lacquering is a custom of dyeing one's teeth black. Light loss is due to filament evaporation and bulb blackening. Hot blackening involves dipping the part into various tanks. It offers less abrasion resistance and the same corrosion protection as the hot blackening process. However, betel chewing damages the teeth and gums while teeth blackening does not. One application for room-temperature blackening is in architectural finishes (patina for stainless steel). Married women marked themselves by blackening their teeth and shaving their eyebrows. Teeth blackening is usually done during puberty. He warned that after one month, MNS workers would start blackening non-Marathi signboards. Cold black oxide offers higher productivity and is convenient for in-house blackening. Whether this means the blackening dead-look appearance would spread throughout the entire body is unknown. In Japan, teeth blackening is known as . The Blazon&colon; The akrafena is used in conjunction with the stool blackening ceremony. They wear distinctive costumes and have a custom of blackening their faces.