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According to my online research glycerin is often used for snow globes. However, some mention that baby oil can also be used.

Which one is preferable, and why?

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Glycerin has a density of about 1.2gm per cm3, while baby oil has density of 0.8.

The less dense baby oil offers less resistance and I imagine will give quicker falling flakes of snow. How much difference you actually notice is the real test. I’d be trying both.

There may be no difference at all. If that’s the case then go with the cheaper liquid.

PDF hart listing glycerol densities at various dilutions. 100% glycerol is the first entry

I can’t see an authoritative figure for baby oil but the answer is given by several online contributors who offer the same number.

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    I think glycerin may be more consistently translucent, too. Baby oils come in scents or colors, sometimes. Or the scents might cause discoloration over time. Hard to tell if the oil is translucent if the bottle isn't translucent, too. – user24 May 24 '19 at 15:58

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