So, you purchased agarwood (oud) oil which usually comes with glass vials or glass bottles
You have been enjoying it until the last drop. What are you going to get every last drop out?
As you are aware, these pure oud oils are rich and intense. To finish up a bottle of 12 ml, it may take several years for some people when by that time, these oud oils have become super viscous making it difficult to "pour" them out
So what are you going to do to when you are unable to get the oud oil out? Well, you can pour solvents such as alcohol or carrier oil in to fill up the bottle again. You can even make a personal perfume or a grooming oil out of it
If you are like an oil based product
Jojoba, argan, fractionated coconut oil camelia oil could be used to create grooming oil. In this case, for example, an oud beard oil/ hair oil which makes you unique. I tried to pour a grooming oil base composed by Escentially Eve Perfumes into one of my 12ml empty oud glass bottles to create a hair oud oil which ultimately could be used as a beard oil too. To add more complexity, a drop or two of sandalwood oil can be blended in which creates a sense of calm, compose and confidence for users
If you like an alcohol base
What type of alcohol should we use? It all depends
If you wanted to make a scented hand-sanitiser, you could you use rubbing alcohol (or isopropyl alcohol). Please beware that isopropyl does have a strong odour. The beauty is once it vapourises, the oud oil will be on your skin for a long period of time.