What are paraffin diesel fuels?

Paraffin diesel fuels can be both synthetic, for example from natural gas (GtL: gas-to-liquid) or electricity (PtL: power-to-liquid) and from biogenic sources, for example from hydrotreated vegetable oils (HVO). HVO, in turn, can come from various biogenic sources, such as used cooking oil or oil-containing residues from forestry and agriculture. As an advanced biofuel according to the definition of the "Reform of the Renewable Energies Directive", these feedstocks must not compete with foodstuffs (e.g. rapeseed, grain and palm oil). Paraffin is a chemical term used to describe saturated hydrocarbons (chemically they only contain carbon-carbon single bonds as opposed to so-called unsaturated hydrocarbons), but it does not contain information on the raw material. To distinguish from conventional diesel fuels, paraffin diesel fuels are uniformly marked with a square and the word/figurative mark "XtL" independent of the manufacturing process (e.g. "HVO", "XtL").