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 counts of any letter, which also caused Nuttin to cast doubt on whether Zajonc's theory could hold true in the real world. Subjective frequency is how frequently subjects a stimulus appears. Name letters may be noticed more and, consequently, assumed to occur more frequently than other letters. Early research into the impact of exposure showed that differences in subjective frequency yielded different results even when the frequency was identical. Hoorens and Nuttin tested whether subjective frequency could be an explanation for the name-letter effect by asking subjects to rank-order the entire alphabet twice, once according to their letter preference and