Extraction Methods of Sulphur

Historically, sulphur (known as brimstone) was obtained from volcanic deposits or by heating iron and copper pyrites. In the late 19th century, the Frasch process became the dominant industrial method for mining deep-lying elemental deposits. This technique involves sinking three concentric pipes into the ground and injecting superheated water (around 170°C) to melt the sulphur. Compressed air is then pumped through the innermost pipe to force the molten sulphur to the surface, resulting in a product that is approximately 99.5% pure.

In modern production, the majority of sulphur is no longer mined but is instead recovered as a byproduct of refining crude oil and processing sour natural gas to comply with environmental regulations. The primary method used today is the Claus process, which recovers elemental sulphur from gaseous hydrogen sulphide (H2S). This process involves a thermal stage where H2S is partially oxidized at high temperatures, followed by multiple catalytic stages that further convert the gases into liquid sulphur. Advanced variations, such as sub-dew point Claus processes, are now employed to achieve recovery efficiencies exceeding 99%.

The Sulphur note is primarily encountered in niche and conceptual perfumery, where it is used to evoke challenging, evocative, or literal 'dark' themes. The most famous example is Sulphur [16S] by One of Those (Perfumer Antoine Lie), which the creator describes as "A juice coming from darkness, a satanic elixir." This fragrance masterfully integrates the sulfur-like nuance—often conveyed by an intense, green-bitter grapefruit and angelica accord—into a complex blend of vetiver, cedar, and warm musk, creating an effect that is cool, crisp, and slightly abrasive rather than traditionally sulfurous.

Given its historical and mythological association with 'fire and brimstone' and the underworld, the note is often utilized by independent houses specializing in dark or fantasy-themed scents. Fragrances from this category include Athanor (Mendittorosa) and the highly conceptual Spinal Fluid On The Walls (Toskovat'). Furthermore, houses like Black Phoenix Alchemy Lab frequently use "brimstone" or "sulfur" to describe notes in perfumes such as Devilish and Tiefling Therapist, employing the unique, pungent aroma to add a layer of unsettling or industrial complexity to a composition.

In broader perfumery, the sulfurous quality is often a subtle, structural element rather than a dominant theme, particularly in compositions featuring natural materials like blackcurrant bud absolute (which contains sulfur compounds) or the intense zest of grapefruit oil. While not explicitly named 'Sulphur', fragrances like Angéliques Sous La Pluie (Frederic Malle) and Zoologist Perfumes. King Cobra have been noted for possessing a similar abrasive, green-bitter, or zesty-tart opening that hints at this chemical profile, giving the scent a distinctive lift and a dirty, dusty, photorealistic freshness.

As a highly conceptual and mineralic note, Sulphur does not follow a traditional botanical growth cycle, but its use in perfumery is deeply influenced by environmental temperature and seasonal atmospheric conditions. In warmer months, heat intensifies the evaporation of volatile sulphur-containing compounds like thiols, causing their sharp, pungent facets to bloom rapidly, which can risk overwhelming a composition if not meticulously diluted. Conversely, during the colder months of autumn and winter, the lower evaporation rate provides better control over these powerful molecules, allowing their darker, industrial, and "fire and brimstone" qualities to linger longer as base notes. Because of its association with volcanic heat and dark energy, Sulphur is often categorized as a "winter" or "autumn" note in niche perfumery, providing a warm, abrasive depth that complements the cozy, intense profiles favored as temperatures drop.