Porcelain is non-porous which means it can hold a perfume liquid or essential oil without absorbing any of it. Instead the liquid slowly dissipates into the air.
If you used a different material that was even slightly porous, the smell would soak in, which would potentially affect things if you wanted to change scents. For instance, you might have trouble getting rid of a peppermint smell after deciding you didn’t like it.
This is why we use porcelain in bathrooms. It can be thoroughly cleaned.
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