transparent nontoxic liquid with density ~2.5g/cm3 and viscosity near water?

hi all, I'm looking for a transparent nontoxic liquid (at room temperature) with density ~2.5g/cm3 and viscosity around liquid Si, that is near
viscosity of water ( / Viscosity#Viscosity_of_water) for experiments with bubbles going up in the liquid.
Difference 10-20 % is ok.
Any ideas? (maybe something like a salt dissolved in water)
Thank you in advance, D.
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