I'm filled with formaldehyde, mixed with glycerin and lanolin.

Their favorite cousin, April Owens, lived in the Mojave Desert for twelve years, collecting spiders in jars filled with formaldehyde.

A corpse filled with formaldehyde and prettied-up with cosmetics to make the dear departed look lifelike, sort of, but not really?

The parts were stored in plastic containers filled with formaldehyde and the packages were destined for an address in Las Vegas.

No, it doesn't feature this bricklayer-turned-Royal Academician's actual brain in some mahogany and brass case filled with formaldehyde; it's far more subtle than that.