Creosote removed; the "heavy oil", which sinks; and the "anthracene oil", which when cold is mostly solid and greasy, of a buttery consistence. Creosote refers to the portion of coal tar which distills as "heavy oil", typically between 230–270 °C, also called "dead oil"; it sinks into water but still is fairly liquid. Carbolic acid is produced in the second fraction of distillation and is often distilled into what is referred to as "carbolic oil". Commercial creosote will contain substances from six groups. The two groups occur in the greatest amounts and are the products of the distillation process—the "tar acids",
A Is for Acid Olive's disappearance and persuades Haigh to accompany her to the police to report Olive missing. Burton also goes to the police after seeing Haigh's picture in a newspaper article about the missing woman, prompting detectives to launch an investigation. Haigh confesses to killing Olive, saying he dissolved her in acid and therefore cannot be prosecuted for her murder, there being no body. He goes on to confess to the other five murders, and claims another three killings. A Home Office pathologist is called in to examine Haigh's workshop where gallstones and a pelvic bone are recovered. After being convicted of