After several hours of distillation, a flavored distillate of approximately 80% ABV is produced. Specific examples are organic solvents such as petroleum distillate, esters, glycol ethers, and the like. White Spirit is a petroleum distillate used as a paint thinner and mild solvent. The standard divides fuels into residual and distillate fuels. Z reflects the spread obtained by trading oil, gasoline and distillate according to this ratio. Methanol was sometimes added to the distillate to enhance profits. Number 2 fuel oil is a distillate home heating oil. The hydrosol portion of the distillate is known as "rosewater". Condensation separates the oil and the aqueous distillate, which is returned to the juice. Cetane numbers are only used for the relatively light distillate diesel oils. No numbers of distillations will ever result in a distillate that exceeds the azeotropic ratio. The ISO standard describe four qualities of distillate fuels and 10 qualities of residual fuels. The condensed vapour flows into a distillate channel. The distillate, a clear liquid, is usually aged in oak barrels. BS 2869 Class C2 is a heavier distillate, which is used as domestic heating oil.