A perfume bottle in an inky shade of purple or black looks stylish and beautiful, but it can make it difficult to gauge how much perfume is left inside. Having an idea of how much perfume is left makes it easier to know when to restock. Also, if planning to swap or sell a perfume, it is necessary to know how much fragrance is left in the bottle. Here are several options to gauge the amount of perfume left in the bottle:
Bright Light
One of the most-effective methods to gauge the perfume content is to shine a bright light through the bottle. Ideally, the perfume bottle should be kept and stored away from direct sunlight. But there is one exception to this rule and that includes attempting to see how much liquid is left in the bottom.
Hold the bottle of perfume in front of a window that enjoys bright sunlight during the day. Even the opaque bottles can give some sort of clue about the volume of perfume left. It is often possible to see a line to indicate the space and where the liquid starts.
If you do not have enough natural sunlight to attempt this test, it is possible to use a very bright light bulb (60 or 100W). This should again let you get a glimpse of the line to show the amount of perfume left at the bottom of the bottle.
Sink In Water
Another option is to immerse the perfume bottle in water. Though this isn’t a practical method for vintage bottles with a paper label since this can cause damage to the label when it starts to dry. In this method, it is a simple process of relying on physics. By immersing the perfume bottle in a suitably sized jug or vase it is possible to produce a substitution of the water’s volume with the bottle’s volume. This is achieved by placing the perfume bottle in the water and letting it float to the surface. It will float to a height where it is still full. This can give a very clear idea of how much perfume is left in the bottle.
All in all, by following the light or water method, it should be possible to get a more accurate sign of the amount of perfume left remaining in the opaque or dark bottles. Shaking the bottle is another option to see if any liquid remains, but this isn’t a very accurate method.