Cold process is the traditional method of making soap. Combining oils (e.g., olive, coconut) with sodium hydroxide (lye) enables saponification to occur (oil + lye = soap.)  "Cold process" means that no external heat is applied to the oil/lye to induce saponification. Cold process becomes artisan handcrafted soap when luxurious butter (e.f., cocoa) essential/fragrance oils, colorants (e.g., micas), botanicals (e.g., lavender buds), and/or exfoliants (e.g., apricot seeds) are added.