Three to five tonnes of Damask roses for one kilogram of oil. A handful of patchouli leaves, dried, lightly fermented, distilled for eight to twenty four hours. Two materials at opposite ends of a perfume: one bright and costly, one dark and lasting. This piece explains why they fit together, then builds a rose and patchouli blend in which geranium and palmarosa carry most of the rose.
A pair at opposite ends of the bottle
Damask roses must be picked by hand at dawn; once the sun rises, the oil in the petals drops quickly. Each picker handles about 30 to 40 kg of flowers a day. The oil yield is only 0.02 to 0.04 percent of the flower weight. According to the library's Damask rose page, good distilled rose oil sells at 8,000 to 15,000 US dollars per kilogram.
Two growing regions set the standard: Bulgaria and Turkey. Damask rose cultivation in Bulgaria dates to the seventeenth century. Oil from the Rose Valley around Kazanlak has a characteristic cocoa and honey note; oil from Isparta in Turkey is fresher. Iran and Morocco also grow it, but on a small scale.
Patchouli sits at the other end. The leaves are dried, lightly fermented and distilled for a long time. Patchouli oil smells woody, earthy, warm, deep and balsamic. Its main molecule is patchouli alcohol, a large, slow-evaporating molecule; this is why patchouli fixes a scent so well and usually sits in the base.
Rose evaporates quickly. Patchouli stays far longer. Set side by side, patchouli holds rose longer on skin, while rose makes patchouli less heavy. This is the logic of a two-material accord: each covers the weak side of the other.
Patchouli also carries a cultural layer. In the hippie culture of the 1960s and 1970s it became a symbol, the scent of free spirit and protest; the library page notes that the association lingers today. Beside rose, that association shifts, from protest towards the classical.
Citronellol, geraniol, phenylethanol
The smell of rose does not come from one molecule. It is the sum of many constituents, but three molecules carry most of it: citronellol, geraniol and phenylethanol. All three are alcohols, all three smell of rose, each with its own shade.
Citronellol smells of fresh rose, gently sweet with a faint citrus edge; it is the foundation rose note. In Damask rose oil, citronellol runs from 16 to 43 percent, depending on whether the source is Bulgarian or Turkish. Geraniol is sweeter, with lemony, waxy facets; Bulgarian rose holds 16 to 26 percent geraniol.
Phenylethanol is the notable case. It smells of fresh, bright, sweet rose, and the library calls it the defining note of solvent-extracted rose, where phenylethanol makes up 65 to 73 percent. In distilled rose oil the figure falls to 0.3 to 2 percent. The same flower, two methods, two different roses.
Damask rose also contains methyleugenol at 0.5 to 3.3 percent. That is why rose oil has a maximum dermal level of 0.6 percent according to the library page. That small number shapes the whole formula below. Solvent-extracted rose carries even more methyleugenol than the distilled oil, so its limit is tighter still.
Geranium and palmarosa extend the rose
Crushed geranium leaves smell of rose and mint leaf. Geranium oil holds citronellol at roughly 19 to 48 percent and geraniol at 7 to 30 percent. In other words, geranium carries the same main molecules as rose, in a different ratio, at a far lower price.
The name says as much. Rose geranium originally meant geranium oil from Réunion, the Bourbon cultivar; Bourbon production is now very small and no longer on the open market. Commercial geranium today comes mainly from Pelargonium × asperum, grown in China, Egypt, Morocco, Madagascar, South Africa and elsewhere.
Palmarosa, which Lê Mai sells as sả hồng, is a tropical Indian grass in the same genus as lemongrass and citronella. The oil, distilled from the aerial parts, holds 70 to 85 percent geraniol and smells of dry rose with a grassy edge. Citronellol is not among the main constituents of palmarosa; it brings the geraniol that geranium and rose hold only in moderate amounts.
In the blend, geranium and palmarosa form the body of the rose, while true rose is only its head and its soul. This is not a matter of saving money; with the 0.6 percent limit on rose, it is the only way to get a rose strong enough for an eau de parfum.
Patchouli: dark earth and sweetness
Freshly distilled patchouli has a camphor note and a certain harshness. Left for five to ten years, it turns softer and rounder; the library page lists patchouli as one of the few oils valued for age, improving for up to ten or twenty years.
The source changes the smell too. Indonesian patchouli, especially from Sumatra, has the highest patchouli alcohol, 28 to 33 percent. Chinese patchouli is cheaper, at 17 to 32 percent. India and Vietnam also produce significant amounts. A short distillation gives a lighter oil; a long one gives a deeper, more balsamic oil. Patchouli is also often adulterated: the library page lists gurjun balsam, copaiba, cedarwood, vetiver and even vegetable oils; GC-MS checks rely on the ratio of patchouli alcohol to alpha bulnesene.
In the rose and patchouli pair, patchouli does more than fix the scent. Its earthiness gives rose depth, and its balsamic sweetness links to the sweetness of phenylethanol and geraniol. With a high share of patchouli the pair leans towards the chypre family; with a low share it is a floral on a woody base.
The library page places patchouli among the safest oils in perfumery: no IFRA limit, and no irritation when tested at 10 percent on 25 volunteers. Some studies report mild phototoxicity, others none; at high concentration on sun-exposed skin, caution is still sensible.
The Lê Mai rose and patchouli blend
Ten drops of patchouli, eight of geranium, five of cedarwood, four of palmarosa, two of pink pepper, one of rose. Thirty drops in all in a 10 ml bottle, 15 percent in perfumer's alcohol.
Patchouli takes a third of the blend, enough to form the base without taking over. Geranium and palmarosa together take about two fifths and form the body of the rose. Cedarwood adds dry wood so the patchouli does not turn too damp. Pink pepper opens the top. One drop of Rose I is the ceiling: a second drop is not possible at this strength.
On a blotter, the first ten minutes are pink pepper and the leafy note of geranium. Then the rose comes up, the dry rose of palmarosa, the fresh rose of geranium, and in the middle the roundness of true rose. After a few hours the rose recedes, and patchouli and cedarwood remain, warm, earthy, slightly sweet.
The blend can move in two directions without touching the drop of rose. For something drier and closer to chypre, add one drop of patchouli and take one off the geranium. For something fresher and closer to a floral, move one drop from cedarwood to palmarosa; total geraniol still stays under the limit, as the check below shows.
| Essential oil | Drops | Share of blend |
|---|---|---|
| Patchouli | 10 | 33% |
| Geranium | 8 | 27% |
| Cedarwood | 5 | 17% |
| Palmarosa | 4 | 13% |
| Pink pepper | 2 | 7% |
| Rose I | 1 | 3% |
The limiting oil is rose: a 0.6 percent maximum dermal level on the Damask rose page, because of methyleugenol. One drop in 30 at 15 percent strength gives about 0.5 percent on skin. Do not raise the rose while keeping the 10 ml bottle and this strength.
Geraniol is the second thing to calculate, since IFRA limits geraniol to 5.3 percent in leave-on products. Palmarosa sits at about 2 percent on skin with up to 85 percent geraniol, geranium at about 4 percent with up to 30 percent, rose at about 0.5 percent with up to 26 percent: estimated total geraniol about 3 percent, below 5.3. Palmarosa also has its own 6.5 percent maximum and geranium 17.5 percent; both are well below.
Patchouli sits at about 5 percent, cedarwood at about 2.5 percent, with no specific limits. Pink pepper sits at about 1 percent; not for people allergic to the cashew and mango family. Citronellol and geraniol must be labelled as allergens under EU rules if the blend is sold as a product. Try it on a small patch of skin before wider use.
Pink pepper brightens the top
Pink peppercorns are small, pale pink fruits of the shrub Schinus terebinthifolius in South America, especially Brazil. They are not true pepper; the plant belongs to the Anacardiaceae, the family of cashew, mango and poison ivy. The name pink peppercorn is therefore misleading.
Pink pepper oil is rich in alpha and beta phellandrene, giving a light, bright, spicy, slightly resinous smell. In the rose and patchouli accord it acts as a modifier: it sets a layer of brightness over a structure that is fairly dark by nature.
Pink pepper carries one safety note. As a relative of cashew and mango, it may cause reactions in people allergic to that family; the library page recommends low dermal concentrations. Two drops in the blend are enough to open the top without turning the whole bottle.
The piece on two-material accords builds the rose and patchouli pair in its most minimal form. This blend adds, between the two, a body of rose from geranium and palmarosa, a little wood, a little spice. The structure still has two poles, but the space between them has been filled.
A costly rose, a cheap handful of leaves.
The bottle does not ask the price. It only keeps what lasts longer.