Twenty drops of a rose and patchouli accord, three small diluted bottles: pink pepper, coriander seed, clary sage. Lesson five of the blending course adds one drop at a time to the old accord and records how the direction of the scent shifts.
The old accord, one new drop
The most unified vial in the nine ratio series from lesson four now becomes the base material. The accord is made up again as a small batch, twenty neat drops at the ratio already found. One part stays untouched as the control. The rest is split into three vials, each receiving a different modifier.
The library's glossary defines a modifier as a material added in small amounts to steer an accord: brighter, darker, greener or warmer, without changing its main character. The key lies in the last clause. The accord remains rose and patchouli; only its direction changes.
Unlike lesson four, this lesson does not look for the point where two scents become one. A modifier does not need to merge. It needs to be small enough not to be recognised as a separate part, and large enough for the accord to smell different from the control.
The three bottles were chosen because they come from three different parts of a plant and work at three different places on the blotter. Pink pepper is a fruit, light, sitting between top and heart. Coriander seed is a seed, almost a single main molecule. Clary sage is an herb, carrying both a bright part and a very slow one. Three bottles, three ways to turn an accord.
Four blotters are dipped at the same moment: one control, three with a modifier. Each is marked with its vial and the time. Comparison always runs in pairs: control against pink pepper, control against coriander seed, control against clary sage.
Diluting to 10 percent for testing
A neat drop is too coarse a unit for a modifier. Add one drop to twenty drops of accord and the modifier makes up nearly 5 percent of the blend. For many materials, 5 percent is enough for them to stop modifying and become a third character.
The method is to dilute each modifier to 10 percent in alcohol first, the same smelling dilution used in lesson four. One drop of a 10 percent solution carries about one tenth of a neat drop. Added to twenty drops of accord, the modifier makes up about 0.5 percent. Two drops come to about 1 percent, four drops to about 2 percent.
Each vial can then become a small series: one, two and four drops of solution. The series shows the level at which the modifier starts to be heard, and the level at which it starts to take over the accord. The band between the two is where a modifier works.
If the accord is still at 10 percent dilution like the vials from lesson four, the modifier should be diluted to 1 percent to keep the same proportion. The general rule: accord and modifier should be compared at the same dilution, so that every drop carries a known amount.
Pink pepper: bright and spiced
Pink peppercorns are small pale pink fruits of Schinus terebinthifolius, a shrub native to South America. The library points out that the name misleads: pink pepper is not true pepper and is not in the Piperaceae family but in the Anacardiaceae, alongside cashew, mango and poison ivy.
Pink pepper oil is mainly light terpenes: α-phellandrene at 15 to 30 percent, β-phellandrene at 8 to 15 percent, δ-3-carene, limonene and α-pinene. The library describes its scent as citrus and spice, sweeter than black pepper. On the volatility chart it sits between top and heart.
In the rose and patchouli accord, the most visible effect of pink pepper is in the opening. The blotter with pink pepper usually opens brighter and spicier than the control, while the base after one day is almost unchanged. This is a modifier that acts mainly on one tier.
Pink pepper is also the material that calls for the most care of the three. The library recommends a low dermal concentration, notes that people allergic to cashew or mango may react, and advises avoiding it in pregnancy for lack of clear data. The oil should be stored dark, sealed and refrigerated.
Coriander seed: linalool and a touch of spice
Coriander seed oil is distilled from the dried seeds of Coriandrum sativum, produced mainly in France, India and the Netherlands. The library notes that seed and leaf give markedly different scents: the seed warm, citrus and spice; the leaf fresh and herbal green. The oil in this lesson is from the seed.
Coriander seed is almost a single material: linalool makes up 59 to 87.5 percent. Linalool is described as soft floral, lightly woody, faintly spicy, one of the most classical floral notes in perfumery. The rest includes α-pinene, γ-terpinene, camphor at 1.6 to 7.7 percent and a little geraniol.
Linalool is what makes coriander seed an easy modifier for a rose accord. Damask rose also contains linalool, in small amounts, alongside geraniol. Coriander seed does not bring in a stranger; it extends what the rose already has, making the floral part airier and lighter. The library's substitution chart also lists coriander seed as an alternative to rosewood, since both are rich in linalool and similarly soft.
Linalool has one point to watch: when oxidised it forms hydroperoxides that are sensitising. The coriander bottle used for testing should be fresh, tightly closed and kept cool. On the volatility chart coriander seed lasts about 8 hours on a blotter, so its effect is clearest in the first hour and fades after that.
Clary sage: herb and dry amber
Clary sage is Salvia sclarea, a Mediterranean herb grown in France, Russia, Bulgaria, China and the USA. The library notes that some lots are distilled from lightly fermented leaves, giving a richer, more vegetal scent.
The main constituents of clary sage are linalyl acetate at 45 to 74 percent and linalool at 9 to 19 percent. This ester and alcohol pair is also the signature of lavender and bergamot. Behind them sits sclareol, a molecule of extremely low volatility that shows up only as a small share when the oil is analysed. Sclareol is described as warm, balsamic, lightly musky, soft wood.
Clary sage therefore acts on the accord at two levels. In the opening, linalyl acetate adds a bright herbal line. At the end, sclareol sits alongside patchoulol and makes the base drier, with an amber tint. The library's Chypre family page describes exactly this role: clary sage carries sclareol and adds a dry ambery touch to the base.
Steam distilled clary sage oil has a low sensitisation risk and is not phototoxic according to the library's data. The absolute is different: a higher sensitisation profile and a maximum of 0.25 percent. This lesson uses only the distilled oil.
When one drop is too many
A modifier has crossed the line when the nose names it before naming the accord. The blotter is no longer a brighter rose and patchouli but pink pepper with rose behind it. By the library's definition, the added material has then changed the main character and is no longer a modifier.
The series of one, two and four drops of solution shows where this line lies. The line differs for each material: one may work well at 2 percent, another may already dominate at 1 percent. As in lesson three, the odour strength of each bottle decides, not the drop count.
The line also moves with time. Pink pepper and coriander seed act strongly in the first hour, then recede. Clary sage has its sclareol fraction that stays longer, so an amount that seems right at five minutes can become obvious after a day, once the floral part has thinned. Each blotter needs to be smelled again at the marks from lesson two before drawing a conclusion.
Modifiers can also work in pairs. Pink pepper brightens the opening, clary sage dries the end; two materials at opposite ends of the blotter rarely overlap. But each addition is a new variable, and a series can only be read when one variable changes at a time.
After this lesson the scent notebook holds a small table: three modifiers, three levels, four time marks, and a column recording the direction of change in one word, brighter, drier, airier. Lesson six goes down to the lowest tier, where fixatives slow the lighter parts from leaving the blotter.
A modifier does not need to be recognised. It only needs to be missed when absent.
The control blotter is the only measure.
Half a percent, and the whole bottle turns.