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",
Name-letter effect work has been called "seminal" by Stieger, Voracek, and Formann in their 2012 meta-analysis of 44 publications on the effect. Their meta-analysis found no trace of publication bias. In her 2014 meta-analysis of dozens of name-letter effect studies, Hoorens called the effect robust. She noted robustness in: Various explanations for the name-letter effect have been explored. Several explanations which seemed plausible at first have since been rejected. People may simply like most what they see most. Letters that appear more frequently in everyday usage also occur more often in people's names. Forer, in 1940, and Alluisi and Adams, in 1962,