I have a herbarium coodinator diploma and teach herbarium: preserving flowers in oil bottle.
*Herbarium is basically an accumulation of plant specimens in botany. But recently, those plant specimens which are made for viewing purposes are also called Herbalium and it is popular among Japanese women because you can enjoy the "flower" over a year without taking any care!
Steps of making herbarium are simple:
1.Choose dry flowers with your favorite combination of flower types, colors, composition and put them into the bottle.
*I will help you with thinking the composition.
2.Pour mineral oil into the bottle.
Through this experience, why don't you bring back your memory in Japan to your country? Let’s try herbarium! I will support you to make your original herbarium that reminds you of your special memory in Japan!
The oil used for herbarium is mineral oil which is same as baby oil.
The flash point of the oil is over 250℃ which does not conflict with the aviation law, but you might be asked at the security about the oil.
Please make sure not to break the bottle, do not leak the oil, and put it in the check-in luggage.
I will give you the zip loc for the bottle if you wish.