Al Shareef Oudh
Master Perfumer
I think it is important to clarify a few things in this discussion in order to have as accurate as understanding on some of the matters as possible.
The first item I would like to comment on; the proposition of 'oil represents the wood' and if/where this is true what type of wood it will be truest with.
Firstly It is important to remember that when we smell wood on charcoal/heater we are smelling notes from three main sources in that piece of wood; Wood Fibres, Oil, Resin. The heat we apply to the wood heats these elements causing them to release the fragrant compounds. As the temperature rises and times passes the compounds continue to rise at different time intervals with different intensity giving us the varied experience in notes and profiles. On the other hand when we smell oudh oil, we are smelling the rise of fragrant compounds from the oil alone, there are no wood fibres or resin present. As such the proposition of an oil representing the wood or being true to the wood aroma is misleading at the least. Can an oil share some similarities with the wood, yes it can and that is mainly limited to what is transferred from the wood via oil droplets in the distillation process to the final oil. I think the picture some of the discussion above is painting is you smell the wood and you smell the oil and its like wow same same.
Secondly, from experience and from science, the final oil shares more scent similarities with the wood that has the most amount of oil not the wood that is the highest in the incense scale. The reason for this is simple, in a wood piece where the ratio of oil is greater than the wood fibre and resin when one heats it, there is more volume of oil present for fragrant compounds to rise from compared to the wood fibres+resin and therefore the majority of the scent one experiences is from the oil. When this wood is distilled that higher oil content makes its way via the distillation process into the final oil, where again we are smelling the oil and this oil will share most similarity with the initial wood.
There is a lot of romantic narrative around incense wood and oils from them. Just like there is a lot of romantic narrative around sinking wood for heating, yet we know sinking grade wood doesn't always provide the best experience.
When analysing an oil from a perfumery perspective where one removes the hat of happy feels and puts on a more analytical hat. The detail, variety, intensity of an oil is dependent on the presence of fragrant compounds and their concentration in the oil. Which type of wood gives the highest concentration of fragrant compounds is not related to whether that wood is incense grade or not. Rather it is related to the wood with the presence of oil with higher content of fragrant compounds.
The second item that I would like to touch upon is regarding the oils we associate with a region vs the variety of species in that region. In Malaysia for example the most common species is the Malaccensis. Therefore by simple probability there is a greater chance that an oil we smell from Malaysia is Malaccensis. It is also more likely that the 10 oils we have from Malaysia are also mostly or all Malaccensis. Having said that Malaysia has 15 other species as well, much more rare, some even noted as being extinct though every now and then report comes of a rare one being sighted. You may have never smelt some of these other species, and if a vendor releases an oil from one less common species which goes against your expectation of the region, If anyone thinks they have smelt everything Malaysian, than try Marjaan. That can't be put down to distillation 'trickery'. There is a lot that can be done with distillations, however the backbone, the DNA, the core of the oil cant be changed.
there is more to be said, but ill leave it there for the moment.
The first item I would like to comment on; the proposition of 'oil represents the wood' and if/where this is true what type of wood it will be truest with.
Firstly It is important to remember that when we smell wood on charcoal/heater we are smelling notes from three main sources in that piece of wood; Wood Fibres, Oil, Resin. The heat we apply to the wood heats these elements causing them to release the fragrant compounds. As the temperature rises and times passes the compounds continue to rise at different time intervals with different intensity giving us the varied experience in notes and profiles. On the other hand when we smell oudh oil, we are smelling the rise of fragrant compounds from the oil alone, there are no wood fibres or resin present. As such the proposition of an oil representing the wood or being true to the wood aroma is misleading at the least. Can an oil share some similarities with the wood, yes it can and that is mainly limited to what is transferred from the wood via oil droplets in the distillation process to the final oil. I think the picture some of the discussion above is painting is you smell the wood and you smell the oil and its like wow same same.
Secondly, from experience and from science, the final oil shares more scent similarities with the wood that has the most amount of oil not the wood that is the highest in the incense scale. The reason for this is simple, in a wood piece where the ratio of oil is greater than the wood fibre and resin when one heats it, there is more volume of oil present for fragrant compounds to rise from compared to the wood fibres+resin and therefore the majority of the scent one experiences is from the oil. When this wood is distilled that higher oil content makes its way via the distillation process into the final oil, where again we are smelling the oil and this oil will share most similarity with the initial wood.
There is a lot of romantic narrative around incense wood and oils from them. Just like there is a lot of romantic narrative around sinking wood for heating, yet we know sinking grade wood doesn't always provide the best experience.
When analysing an oil from a perfumery perspective where one removes the hat of happy feels and puts on a more analytical hat. The detail, variety, intensity of an oil is dependent on the presence of fragrant compounds and their concentration in the oil. Which type of wood gives the highest concentration of fragrant compounds is not related to whether that wood is incense grade or not. Rather it is related to the wood with the presence of oil with higher content of fragrant compounds.
The second item that I would like to touch upon is regarding the oils we associate with a region vs the variety of species in that region. In Malaysia for example the most common species is the Malaccensis. Therefore by simple probability there is a greater chance that an oil we smell from Malaysia is Malaccensis. It is also more likely that the 10 oils we have from Malaysia are also mostly or all Malaccensis. Having said that Malaysia has 15 other species as well, much more rare, some even noted as being extinct though every now and then report comes of a rare one being sighted. You may have never smelt some of these other species, and if a vendor releases an oil from one less common species which goes against your expectation of the region, If anyone thinks they have smelt everything Malaysian, than try Marjaan. That can't be put down to distillation 'trickery'. There is a lot that can be done with distillations, however the backbone, the DNA, the core of the oil cant be changed.
there is more to be said, but ill leave it there for the moment.